$$\int x^2\cos(mx)\,dx$$
When integrating this by parts, the $x^2$ will become the $u$ and the $\cos(mx)\,dx$ will become $dv$.
How is the $\cos(mx)$ integrated if there are two variables?
2m+(50s)(0.5m/s)
=
2m + 25m/{s}^{2}
=
Not possible
My teacher keeps saying this is pure piffle and shaking his head. Can someone please explain this to me?