Integral of tan^5(x) | Summary and Q&A

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March 18, 2018
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The Organic Chemistry Tutor
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Integral of tan^5(x)

TL;DR

This video explains how to find the antiderivative of tangent to the fifth power of X by utilizing trigonometric identities and u-substitution.

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Questions & Answers

Q: What is the first step in finding the antiderivative of tangent to the fifth power of X?

The first step is to rewrite the expression by taking out a tangent squared term using the Pythagorean identity and replacing it with secant squared minus 1.

Q: How are the integrals of tangent cubed with secant squared and tangent cubed on their own handled differently?

The integral of tangent cubed with secant squared is split into two separate integrals, while the integral of tangent cubed is left as is.

Q: What trigonometric identity is used to simplify the expression further?

The Pythagorean identity is used to replace tangent squared with secant squared minus 1.

Q: How is the integral of tangent X simplified using u-substitution?

By substituting u for tangent X and using the corresponding derivative, the integral of tangent X becomes the natural log of secant X.

Summary & Key Takeaways

  • By using the Pythagorean identity (1 + tangent squared = secant squared), we can replace tangent squared with secant squared minus 1 in the integral expression.

  • The integral of tangent to the third power times secant squared can be broken down into two separate integrals.

  • U-substitution is used to simplify the integrals, resulting in the final answer of 1/4 tangent to the fourth power minus 1/2 tangent squared plus the natural log of secant X.

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