
Home > CALC > Chapter 9 > Lesson 9.2.2 > Problem 9-64
9-64.
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