Primitive of Cotangent of a x

Theorem

 * $\ds \int \cot a x \rd x = \frac {\ln \size {\sin a x} } a + C$

Also see

 * Primitive of $\sin a x$
 * Primitive of $\cos a x$
 * Primitive of $\tan a x$
 * Primitive of $\sec a x$
 * Primitive of $\csc a x$