Primitive of Exponential of a x by Hyperbolic Cosine of b x

Theorem

 * $\displaystyle \int e^{a x} \cosh b x \rd x = \frac {e^{a x} \paren {a \cosh b x + b \sinh b x} } {a^2 - b^2} + C$

Also see

 * Primitive of $e^{a x} \sinh b x$