### Home > CALC > Chapter 11 > Lesson 11.1.2 > Problem 11-22

11-22.

Use *u*-substitution. Let *u* = sec(*x*).

cos^{2}(*x*) – sin^{2}(*x*) = cos(2*x*)

Use *u*-substitution. Let *u* = sin(2*x*).

Note: Given *dx*, *x* is the only variable.

The integrand is a multiple of an inverse trigonometric function. Which one?