Primitive of Reciprocal of Square of Hyperbolic Sine of a x by Hyperbolic Cosine of a x

Theorem

 * $\displaystyle \int \frac {\mathrm d x} {\sinh^2 a x \cosh a x} = -\frac 1 a \arctan \left({\sinh a x}\right) - \frac {\operatorname{csch} a x} a + C$