# Math Help - Please help me with integration by parts

evaluate the integral by using integration by parts

2. Originally Posted by yang03265

evaluate the integral by using integration by parts
Recall that the IBP formula is $\int u\,dv=uv-\int v\,du$

Let $u=x$ and $\,dv=\cos^2x\,dx$.

I leave the computation work for you to do, but take note that $\cos^2x=\tfrac{1}{2}\left(1+\cos\!\left(2x\right)\ right)$.

Can you try to take it from here?