# Thread: (probably) Easy U-substitution definite integral problem?

1. ## (probably) Easy U-substitution definite integral problem?

$\displaystyle \int^\pi_0 3cos^2(x)sin(x) dx$

I know how to find the area but I've tried various u's and I can't get anything to work.

Thanks, chickeneaterguy

2. Let $\displaystyle u=\cos(x)$ and proceed.

3. Originally Posted by harish21
Let $\displaystyle u=\cos(x)$ and proceed.
Holy crap...I feel retarded. Thanks a lot. I was doing it with sin and making the leftover cosx into sqrt(1-sin)... thanks for making my life easier