# Thread: Minor help with integrals

1. ## Minor help with integrals

Needing to evaluate the integral:

sin(2x)/(47+(cos(x))^2)dx

This question might belong somewhere else but.. It's been a while since I've taken trig and is (cos(x))^2 the same as cos^2(x) or 2cos(x) or something entirely different?

2. Rewrite $sin(2x)$ as $2sin(x)cos(x)$

then substitute $u=cos^2(x)$ ..

3. ahh, thanks. I'm not good with trig identities.