Primitive of Reciprocal of Power of Cosine of a x by Power of Sine of a x/Reduction of Power of Sine

Theorem

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