Primitive of Cube of Cotangent of a x

Theorem

 * $\displaystyle \int \cot^3 a x \ \mathrm d x = \frac {-\cot^2 a x} {2 a} - \frac 1 a \ln \left\vert{\sin a x}\right\vert + C$

Also see

 * Primitive of $\tan^3 a x$