# Math Help - Integration problem

1. ## Integration problem

How do i integrate (y^2)(cos3y)dy ?

2. Originally Posted by kandyfloss
How do i integrate (y^2)(cos3y)dy ?
integration by parts (twice), or the tabular method, if you've learned it

take $u = y^2$ and $dv = \cos 3y ~dy$ in the integration by parts formula $\left( \int u~dv = uv - \int v~du \right)$