Home > APCALC > Chapter 7 > Lesson 7.3.5 > Problem7-155

7-155.

Use the identity $\cos(2x) = 2 \cos^2(x) - 1$ to evaluate $\int 4 \operatorname { cos } ^ { 2 } ( x ) d x$. Homework Help ✎

$\int 4\cos^{2}(x)dx=2\int 2\cos^{2}(x)-1+1dx=$