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9-64.
1. Examine the integrals below. Consider the multiple tools available for integrating and use the best strategy. After evaluating each integral, write a short description of your method. Homework Help ✎

Use substitution: Let u = x2 + 1

cos(4θ) = cos(2(2θ)) = 2(cos2(2θ)) − 1

Substitute using the hint, then integrate using substitution.
Let u = cos(2θ).

The integrand is a multiple of an inverse trigonometric function derivative.

Use substitution: Let u = x4