{"id":716,"date":"2025-07-14T21:27:02","date_gmt":"2025-07-14T21:27:02","guid":{"rendered":"https:\/\/content.one.lumenlearning.com\/precalculus\/?post_type=chapter&#038;p=716"},"modified":"2026-01-19T17:11:37","modified_gmt":"2026-01-19T17:11:37","slug":"module-20-introduction-to-calculus-cheat-sheet","status":"publish","type":"chapter","link":"https:\/\/content.one.lumenlearning.com\/precalculus\/chapter\/module-20-introduction-to-calculus-cheat-sheet\/","title":{"raw":"Introduction to Calculus: Cheat Sheet","rendered":"Introduction to Calculus: Cheat Sheet"},"content":{"raw":"<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Essential Concepts<\/h2>\r\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Finding Limits<\/h3>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A limit describes the behavior of a function as the input values get close to a specific value. We write [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex] to indicate that as [latex]x[\/latex] approaches [latex]a[\/latex], the output value [latex]f(x)[\/latex] approaches [latex]L[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of a function as [latex]x[\/latex] approaches [latex]a[\/latex] can exist even when [latex]f(a)[\/latex] does not exist or when [latex]f(a)\\neq L[\/latex]. The value of the limit is not affected by the output value of [latex]f(x)[\/latex] at [latex]a[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>One-sided limits:<\/strong><\/p>\r\n\r\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Left-hand limit: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex] means the output approaches [latex]L[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the left (where [latex]x&lt;a[\/latex] and [latex]x\\neq a[\/latex])<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Right-hand limit: [latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex] means the output approaches [latex]L[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the right (where [latex]x&gt;a[\/latex] and [latex]x\\neq a[\/latex])<\/li>\r\n<\/ul>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Two-sided limits:<\/strong> A two-sided limit exists if and only if both one-sided limits exist and are equal: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]. When we refer to \"a limit\" without specifying, we mean a two-sided limit.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Finding limits using graphs:<\/strong> A graph provides a visual method for determining limits. If the function has a limit as [latex]x[\/latex] approaches [latex]a[\/latex], the branches of the graph will approach the same y-coordinate near [latex]x=a[\/latex] from both the left and right.<\/p>\r\n\r\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Examine the graph as [latex]x[\/latex] approaches [latex]a[\/latex] from the left to determine if a left-hand limit exists<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Examine the graph as [latex]x[\/latex] approaches [latex]a[\/latex] from the right to determine if a right-hand limit exists<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">If both one-sided limits exist and are equal, then the two-sided limit exists<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Check if there is a point at [latex]x=a[\/latex] to determine if [latex]f(a)[\/latex] exists<\/li>\r\n<\/ol>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Finding limits using tables:<\/strong> A table can be used to determine if a function has a limit by showing input values that approach [latex]a[\/latex] from both directions.<\/p>\r\n\r\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Choose input values that approach [latex]a[\/latex] from both the left and right<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Evaluate the function at each input value and record in a table<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Determine if the output values approach a specific number [latex]L[\/latex] from both sides<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">If the output values approach the same number from both directions, the limit is [latex]L[\/latex]<\/li>\r\n<\/ol>\r\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Properties of Limits<\/h3>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">When limits exist and are finite, we can perform operations using the properties below. Let [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=A[\/latex] and [latex]\\underset{x\\to a}{\\mathrm{lim}}g(x)=B[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Basic properties:<\/strong><\/p>\r\n\r\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Constant: [latex]\\underset{x\\to a}{\\mathrm{lim}}k=k[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Constant times a function: [latex]\\underset{x\\to a}{\\mathrm{lim}}[k\\cdot f(x)]=k\\cdot A[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Sum: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)+g(x)]=A+B[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Difference: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)-g(x)]=A-B[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Product: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)\\cdot g(x)]=A\\cdot B[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Quotient: [latex]\\underset{x\\to a}{\\mathrm{lim}}\\frac{f(x)}{g(x)}=\\frac{A}{B}[\/latex], where [latex]B\\neq 0[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Power: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)]^{n}=A^{n}[\/latex], where [latex]n[\/latex] is a positive integer<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Root: [latex]\\underset{x\\to a}{\\mathrm{lim}}\\sqrt[n]{f(x)}=\\sqrt[n]{A}[\/latex], where [latex]n[\/latex] is a positive integer<\/li>\r\n<\/ul>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Limits of polynomials:<\/strong> For a polynomial function [latex]p(x)[\/latex], we have [latex]\\underset{x\\to a}{\\mathrm{lim}}p(x)=p(a)[\/latex]. The limit can be found by finding the sum of the limits of the individual terms, or more simply, by direct substitution of [latex]a[\/latex] into the polynomial.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Evaluating limits of quotients:<\/strong> When the denominator evaluates to 0, rewrite the function algebraically before applying limit properties:<\/p>\r\n\r\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Factor the numerator and denominator, then cancel common factors and simplify<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Find the LCD if the numerator or denominator contains complex fractions, then simplify<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Multiply by the conjugate if the expression contains a square root; multiply numerator and denominator by the conjugate<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Use numeric evidence (tables or graphs) for functions with absolute values, or set up piecewise<\/li>\r\n<\/ol>\r\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Continuity<\/h3>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function is continuous at [latex]x=a[\/latex] if there are no holes or breaks in its graph at that point. A discontinuous function is one that has any hole or break in its graph.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Three conditions for continuity:<\/strong> A function [latex]f(x)[\/latex] is continuous at [latex]x=a[\/latex] if all three conditions hold:<\/p>\r\n\r\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Condition 1: [latex]f(a)[\/latex] exists<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Condition 2: [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists at [latex]x=a[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Condition 3: [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex]<\/li>\r\n<\/ol>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">If any condition fails, the function is discontinuous at [latex]x=a[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Functions that are continuous everywhere:<\/strong><\/p>\r\n\r\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Polynomial functions<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Exponential functions<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Sine functions<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Cosine functions<\/li>\r\n<\/ul>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Functions continuous on their domain:<\/strong><\/p>\r\n\r\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Logarithmic functions<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Tangent functions<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Rational functions<\/li>\r\n<\/ul>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Types of discontinuities:<\/strong><\/p>\r\n\r\n<ul>\r\n \t<li class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Jump discontinuity: Occurs when left-hand and right-hand limits both exist but are not equal: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)\\neq\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]. The graph \"jumps\" from one value to another at the point of discontinuity.<\/li>\r\n \t<li class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Removable discontinuity: Occurs when [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists, but either [latex]f(a)[\/latex] does not exist or [latex]f(a)\\neq\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]. There is a \"hole\" in the graph. The function can be redefined at its discontinuous point to make it continuous.<\/li>\r\n \t<li>Infinite discontinuity: Occurs when one or both of the one-sided limits approaches positive or negative infinity. The graph typically has a vertical asymptote at [latex]x=a[\/latex].<\/li>\r\n<\/ul>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Determining continuity of piecewise functions:<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">To check continuity at a boundary point [latex]x=a[\/latex]:<\/p>\r\n\r\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\r\n \t<li class=\"whitespace-normal break-words pl-2\">Verify each component function is continuous on its domain<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Evaluate the left-hand limit using the piece defined for [latex]x&lt;a[\/latex]<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Evaluate the right-hand limit using the piece defined for [latex]x&gt;a[\/latex] (or [latex]x\\geq a[\/latex])<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Find [latex]f(a)[\/latex] using whichever piece includes [latex]x=a[\/latex] in its domain<\/li>\r\n \t<li class=\"whitespace-normal break-words pl-2\">Check if all three conditions of continuity are satisfied: [latex]f(a)[\/latex] exists, [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists (both one-sided limits are equal), and [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex]<\/li>\r\n<\/ol>\r\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Derivatives<\/h3>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The derivative of a function at a point represents the instantaneous rate of change at that point. It can also be interpreted as the slope of the tangent line to the graph at that point.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Instantaneous rate of change<\/strong>: The derivative measures how quickly the output of a function is changing at a specific input value, unlike average rate of change which measures change over an interval.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Tangent line<\/strong>: A line that touches the graph of a function at exactly one point and has the same slope as the function at that point. The equation of the tangent line to [latex]f(x)[\/latex] at [latex]x=a[\/latex] can be found using the derivative and point-slope form.<\/p>\r\n\r\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Key Equations<\/h2>\r\n<table style=\"width: 100%;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit notation<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Left-hand limit<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Right-hand limit<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a constant<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}k=k[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of constant times a function<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[k\\cdot f(x)]=k\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a sum<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)+g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)+\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a difference<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)-g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)-\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a product<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)\\cdot g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)\\cdot\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a quotient<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}\\frac{f(x)}{g(x)}=\\frac{\\underset{x\\to a}{\\mathrm{lim}}f(x)}{\\underset{x\\to a}{\\mathrm{lim}}g(x)}[\/latex], where [latex]\\underset{x\\to a}{\\mathrm{lim}}g(x)\\neq 0[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a power<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)]^{n}=[\\underset{x\\to a}{\\mathrm{lim}}f(x)]^{n}[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a root<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}\\sqrt[n]{f(x)}=\\sqrt[n]{\\underset{x\\to a}{\\mathrm{lim}}f(x)}[\/latex]<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 41.2519%;\"><strong>Limit of a polynomial<\/strong><\/td>\r\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}p(x)=p(a)[\/latex]<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Glossary<\/h2>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>continuous function<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that has no holes or breaks in its graph; a function [latex]f(x)[\/latex] is continuous at [latex]x=a[\/latex] if [latex]f(a)[\/latex] exists, [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists, and [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>derivative<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The instantaneous rate of change of a function at a point; also represents the slope of the tangent line to the graph of the function at that point.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>discontinuous function<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that is not continuous at [latex]x=a[\/latex]; a function that has one or more holes or breaks in its graph.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>infinite discontinuity<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where one or both of the one-sided limits approaches positive or negative infinity; the graph typically has a vertical asymptote at [latex]x=a[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>instantaneous rate of change<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The rate at which a function is changing at a specific point, measured by the derivative; describes how quickly the output changes relative to the input at an exact moment.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>jump discontinuity<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where both the left-hand and right-hand limits exist, but [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)\\neq\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]; the graph \"jumps\" from one value to another.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>left-hand limit<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of values of [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the left, denoted [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex]. The values of [latex]f(x)[\/latex] can get as close to the limit [latex]L[\/latex] as we like by taking values of [latex]x[\/latex] sufficiently close to [latex]a[\/latex] such that [latex]x&lt;a[\/latex] and [latex]x\\neq a[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>limit<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">When it exists, the value [latex]L[\/latex] that the output of a function [latex]f(x)[\/latex] approaches as the input [latex]x[\/latex] gets closer and closer to [latex]a[\/latex] but does not equal [latex]a[\/latex]. The value of the output [latex]f(x)[\/latex] can get as close to [latex]L[\/latex] as we choose by using input values of [latex]x[\/latex] sufficiently near to [latex]x=a[\/latex], but not necessarily at [latex]x=a[\/latex]. Denoted [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>properties of limits<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A collection of theorems for finding limits of functions by performing mathematical operations on the limits.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>removable discontinuity<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where the limit exists but either [latex]f(a)[\/latex] does not exist or [latex]f(a)\\neq\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]; the function can be redefined at its discontinuous point to make it continuous.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>right-hand limit<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of values of [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the right, denoted [latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex]. The values of [latex]f(x)[\/latex] can get as close to the limit [latex]L[\/latex] as we like by taking values of [latex]x[\/latex] sufficiently close to [latex]a[\/latex] where [latex]x&gt;a[\/latex] and [latex]x\\neq a[\/latex].<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>stepwise function<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that remains constant over intervals and then jumps instantaneously to different values; an example of a function with jump discontinuities.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>tangent line<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A line that touches the graph of a function at exactly one point and has the same instantaneous rate of change (slope) as the function at that point.<\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>two-sided limit<\/strong><\/p>\r\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of a function [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] is equal to [latex]L[\/latex], denoted [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex], if and only if [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex].<\/p>","rendered":"<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Essential Concepts<\/h2>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Finding Limits<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A limit describes the behavior of a function as the input values get close to a specific value. We write [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex] to indicate that as [latex]x[\/latex] approaches [latex]a[\/latex], the output value [latex]f(x)[\/latex] approaches [latex]L[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of a function as [latex]x[\/latex] approaches [latex]a[\/latex] can exist even when [latex]f(a)[\/latex] does not exist or when [latex]f(a)\\neq L[\/latex]. The value of the limit is not affected by the output value of [latex]f(x)[\/latex] at [latex]a[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>One-sided limits:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Left-hand limit: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex] means the output approaches [latex]L[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the left (where [latex]x<a[\/latex] and [latex]x\\neq a[\/latex])<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Right-hand limit: [latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex] means the output approaches [latex]L[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the right (where [latex]x>a[\/latex] and [latex]x\\neq a[\/latex])<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Two-sided limits:<\/strong> A two-sided limit exists if and only if both one-sided limits exist and are equal: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]. When we refer to &#8220;a limit&#8221; without specifying, we mean a two-sided limit.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Finding limits using graphs:<\/strong> A graph provides a visual method for determining limits. If the function has a limit as [latex]x[\/latex] approaches [latex]a[\/latex], the branches of the graph will approach the same y-coordinate near [latex]x=a[\/latex] from both the left and right.<\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Examine the graph as [latex]x[\/latex] approaches [latex]a[\/latex] from the left to determine if a left-hand limit exists<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Examine the graph as [latex]x[\/latex] approaches [latex]a[\/latex] from the right to determine if a right-hand limit exists<\/li>\n<li class=\"whitespace-normal break-words pl-2\">If both one-sided limits exist and are equal, then the two-sided limit exists<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Check if there is a point at [latex]x=a[\/latex] to determine if [latex]f(a)[\/latex] exists<\/li>\n<\/ol>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Finding limits using tables:<\/strong> A table can be used to determine if a function has a limit by showing input values that approach [latex]a[\/latex] from both directions.<\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Choose input values that approach [latex]a[\/latex] from both the left and right<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Evaluate the function at each input value and record in a table<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Determine if the output values approach a specific number [latex]L[\/latex] from both sides<\/li>\n<li class=\"whitespace-normal break-words pl-2\">If the output values approach the same number from both directions, the limit is [latex]L[\/latex]<\/li>\n<\/ol>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Properties of Limits<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">When limits exist and are finite, we can perform operations using the properties below. Let [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=A[\/latex] and [latex]\\underset{x\\to a}{\\mathrm{lim}}g(x)=B[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Basic properties:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Constant: [latex]\\underset{x\\to a}{\\mathrm{lim}}k=k[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Constant times a function: [latex]\\underset{x\\to a}{\\mathrm{lim}}[k\\cdot f(x)]=k\\cdot A[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Sum: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)+g(x)]=A+B[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Difference: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)-g(x)]=A-B[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Product: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)\\cdot g(x)]=A\\cdot B[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Quotient: [latex]\\underset{x\\to a}{\\mathrm{lim}}\\frac{f(x)}{g(x)}=\\frac{A}{B}[\/latex], where [latex]B\\neq 0[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Power: [latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)]^{n}=A^{n}[\/latex], where [latex]n[\/latex] is a positive integer<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Root: [latex]\\underset{x\\to a}{\\mathrm{lim}}\\sqrt[n]{f(x)}=\\sqrt[n]{A}[\/latex], where [latex]n[\/latex] is a positive integer<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Limits of polynomials:<\/strong> For a polynomial function [latex]p(x)[\/latex], we have [latex]\\underset{x\\to a}{\\mathrm{lim}}p(x)=p(a)[\/latex]. The limit can be found by finding the sum of the limits of the individual terms, or more simply, by direct substitution of [latex]a[\/latex] into the polynomial.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Evaluating limits of quotients:<\/strong> When the denominator evaluates to 0, rewrite the function algebraically before applying limit properties:<\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Factor the numerator and denominator, then cancel common factors and simplify<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Find the LCD if the numerator or denominator contains complex fractions, then simplify<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Multiply by the conjugate if the expression contains a square root; multiply numerator and denominator by the conjugate<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Use numeric evidence (tables or graphs) for functions with absolute values, or set up piecewise<\/li>\n<\/ol>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Continuity<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function is continuous at [latex]x=a[\/latex] if there are no holes or breaks in its graph at that point. A discontinuous function is one that has any hole or break in its graph.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Three conditions for continuity:<\/strong> A function [latex]f(x)[\/latex] is continuous at [latex]x=a[\/latex] if all three conditions hold:<\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Condition 1: [latex]f(a)[\/latex] exists<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Condition 2: [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists at [latex]x=a[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Condition 3: [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex]<\/li>\n<\/ol>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">If any condition fails, the function is discontinuous at [latex]x=a[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Functions that are continuous everywhere:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Polynomial functions<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Exponential functions<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Sine functions<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Cosine functions<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Functions continuous on their domain:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Logarithmic functions<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Tangent functions<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Rational functions<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Types of discontinuities:<\/strong><\/p>\n<ul>\n<li class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Jump discontinuity: Occurs when left-hand and right-hand limits both exist but are not equal: [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)\\neq\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]. The graph &#8220;jumps&#8221; from one value to another at the point of discontinuity.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Removable discontinuity: Occurs when [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists, but either [latex]f(a)[\/latex] does not exist or [latex]f(a)\\neq\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]. There is a &#8220;hole&#8221; in the graph. The function can be redefined at its discontinuous point to make it continuous.<\/li>\n<li>Infinite discontinuity: Occurs when one or both of the one-sided limits approaches positive or negative infinity. The graph typically has a vertical asymptote at [latex]x=a[\/latex].<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Determining continuity of piecewise functions:<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">To check continuity at a boundary point [latex]x=a[\/latex]:<\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Verify each component function is continuous on its domain<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Evaluate the left-hand limit using the piece defined for [latex]x<a[\/latex]<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Evaluate the right-hand limit using the piece defined for [latex]x>a[\/latex] (or [latex]x\\geq a[\/latex])<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Find [latex]f(a)[\/latex] using whichever piece includes [latex]x=a[\/latex] in its domain<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Check if all three conditions of continuity are satisfied: [latex]f(a)[\/latex] exists, [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists (both one-sided limits are equal), and [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex]<\/li>\n<\/ol>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Derivatives<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The derivative of a function at a point represents the instantaneous rate of change at that point. It can also be interpreted as the slope of the tangent line to the graph at that point.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Instantaneous rate of change<\/strong>: The derivative measures how quickly the output of a function is changing at a specific input value, unlike average rate of change which measures change over an interval.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Tangent line<\/strong>: A line that touches the graph of a function at exactly one point and has the same slope as the function at that point. The equation of the tangent line to [latex]f(x)[\/latex] at [latex]x=a[\/latex] can be found using the derivative and point-slope form.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Key Equations<\/h2>\n<table style=\"width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit notation<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Left-hand limit<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Right-hand limit<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a constant<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}k=k[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of constant times a function<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[k\\cdot f(x)]=k\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a sum<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)+g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)+\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a difference<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)-g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)-\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a product<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)\\cdot g(x)]=\\underset{x\\to a}{\\mathrm{lim}}f(x)\\cdot\\underset{x\\to a}{\\mathrm{lim}}g(x)[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a quotient<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}\\frac{f(x)}{g(x)}=\\frac{\\underset{x\\to a}{\\mathrm{lim}}f(x)}{\\underset{x\\to a}{\\mathrm{lim}}g(x)}[\/latex], where [latex]\\underset{x\\to a}{\\mathrm{lim}}g(x)\\neq 0[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a power<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}[f(x)]^{n}=[\\underset{x\\to a}{\\mathrm{lim}}f(x)]^{n}[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a root<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}\\sqrt[n]{f(x)}=\\sqrt[n]{\\underset{x\\to a}{\\mathrm{lim}}f(x)}[\/latex]<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 41.2519%;\"><strong>Limit of a polynomial<\/strong><\/td>\n<td style=\"width: 57.7524%;\">[latex]\\underset{x\\to a}{\\mathrm{lim}}p(x)=p(a)[\/latex]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Glossary<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>continuous function<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that has no holes or breaks in its graph; a function [latex]f(x)[\/latex] is continuous at [latex]x=a[\/latex] if [latex]f(a)[\/latex] exists, [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex] exists, and [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=f(a)[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>derivative<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The instantaneous rate of change of a function at a point; also represents the slope of the tangent line to the graph of the function at that point.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>discontinuous function<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that is not continuous at [latex]x=a[\/latex]; a function that has one or more holes or breaks in its graph.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>infinite discontinuity<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where one or both of the one-sided limits approaches positive or negative infinity; the graph typically has a vertical asymptote at [latex]x=a[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>instantaneous rate of change<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The rate at which a function is changing at a specific point, measured by the derivative; describes how quickly the output changes relative to the input at an exact moment.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>jump discontinuity<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where both the left-hand and right-hand limits exist, but [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)\\neq\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex]; the graph &#8220;jumps&#8221; from one value to another.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>left-hand limit<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of values of [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the left, denoted [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=L[\/latex]. The values of [latex]f(x)[\/latex] can get as close to the limit [latex]L[\/latex] as we like by taking values of [latex]x[\/latex] sufficiently close to [latex]a[\/latex] such that [latex]x<a[\/latex] and [latex]x\\neq a[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>limit<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">When it exists, the value [latex]L[\/latex] that the output of a function [latex]f(x)[\/latex] approaches as the input [latex]x[\/latex] gets closer and closer to [latex]a[\/latex] but does not equal [latex]a[\/latex]. The value of the output [latex]f(x)[\/latex] can get as close to [latex]L[\/latex] as we choose by using input values of [latex]x[\/latex] sufficiently near to [latex]x=a[\/latex], but not necessarily at [latex]x=a[\/latex]. Denoted [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>properties of limits<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A collection of theorems for finding limits of functions by performing mathematical operations on the limits.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>removable discontinuity<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A point of discontinuity in a function [latex]f(x)[\/latex] at [latex]x=a[\/latex] where the limit exists but either [latex]f(a)[\/latex] does not exist or [latex]f(a)\\neq\\underset{x\\to a}{\\mathrm{lim}}f(x)[\/latex]; the function can be redefined at its discontinuous point to make it continuous.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>right-hand limit<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of values of [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] from the right, denoted [latex]\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)=L[\/latex]. The values of [latex]f(x)[\/latex] can get as close to the limit [latex]L[\/latex] as we like by taking values of [latex]x[\/latex] sufficiently close to [latex]a[\/latex] where [latex]x>a[\/latex] and [latex]x\\neq a[\/latex].<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>stepwise function<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A function that remains constant over intervals and then jumps instantaneously to different values; an example of a function with jump discontinuities.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>tangent line<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A line that touches the graph of a function at exactly one point and has the same instantaneous rate of change (slope) as the function at that point.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>two-sided limit<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The limit of a function [latex]f(x)[\/latex] as [latex]x[\/latex] approaches [latex]a[\/latex] is equal to [latex]L[\/latex], denoted [latex]\\underset{x\\to a}{\\mathrm{lim}}f(x)=L[\/latex], if and only if [latex]\\underset{x\\to a^{-}}{\\mathrm{lim}}f(x)=\\underset{x\\to a^{+}}{\\mathrm{lim}}f(x)[\/latex].<\/p>\n","protected":false},"author":67,"menu_order":1,"template":"","meta":{"_candela_citation":"[]","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"part":263,"module-header":"cheat_sheet","content_attributions":[],"internal_book_links":[],"video_content":null,"cc_video_embed_content":{"cc_scripts":"","media_targets":[]},"try_it_collection":null,"_links":{"self":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapters\/716"}],"collection":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/wp\/v2\/users\/67"}],"version-history":[{"count":7,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapters\/716\/revisions"}],"predecessor-version":[{"id":5425,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapters\/716\/revisions\/5425"}],"part":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/parts\/263"}],"metadata":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapters\/716\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/wp\/v2\/media?parent=716"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/pressbooks\/v2\/chapter-type?post=716"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/wp\/v2\/contributor?post=716"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/content.one.lumenlearning.com\/precalculus\/wp-json\/wp\/v2\/license?post=716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}