Hi, not looking for an answer here, just the first step or two to get me started

Prove

$\displaystyle \int\frac{x^2}{(a^2+x^2)^n}\, dx= \frac{1}{2n-2}\left(-\frac{x}{(a^2+x^2)^{n-1}}+\int\frac{dx}{(a^2+x^2)^{n-1}}\right)$

Much appreciated

Stonehambey