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Integration Using Trigonometric Substitution Brought to you by Tutorial Services – The Math Center

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To eliminate radicals in the integrand using Trigonometric Substitution For integrals involving use u = a sin For integrals involving use u = a tan For integrals involving use u = a sec Objective

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For integrals involving Let u = a sin Inside the radical you will have Using the Pythagorean Identities, that is equal to This will result in = a cos

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For integrals involving Let u = a tan Inside the radical you will have Using the Pythagorean Identities, that is equal to This will result in = a sec

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For integrals involving Let u = a sec Inside the radical you will have Using the Pythagorean Identities, that is equal to This will result in = + a tan Positive if u > a, Negative if u < - a

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Converting Limits By converting limits, you avoid changing back to x, after you are done with the integration Because has the form then u = x, a = 3, and x = 3 sin then u = x, a = 3, and x = 3 sin

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Converting Limits Now, when x = 0, the Lower Limits is: 0 = 3 sin 0 = 3 sin 0 = sin 0 = sin 0 = 0 = Now, when x = 3, the Upper Limit is: 3 = 3 sin 3 = 3 sin 1 = sin 1 = sin /2 =

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Examples ► Solve the following integrals:

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Integration Using Trigonometric Substitution Links ► Integration Using Trigonometric Substitution Handout Integration Using Trigonometric Substitution Handout Integration Using Trigonometric Substitution Handout ► Trigonometric Identities Handout Trigonometric Identities Handout Trigonometric Identities Handout ► Integrals and Derivatives Handout Integrals and Derivatives Handout Integrals and Derivatives Handout ► Trigonometric Substitution Quiz Trigonometric Substitution Quiz Trigonometric Substitution Quiz

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