Primitive of Power of Cotangent of a x

Theorem

 * $\displaystyle \int \cot^n a x \ \mathrm d x = \frac {-\cot^{n - 1} a x} {\left({n - 1}\right) a} - \int \cot^{n - 2} a x \ \mathrm d x + C$

Also see

 * Primitive of $\tan^n a x$