Primitive of x squared by Hyperbolic Cosine of a x

Theorem

 * $\ds \int x^2 \cosh a x \rd x = \paren {\frac {x^2} a + \frac 2 {a^3} } \sinh a x - \frac {2 x \cosh a x} {a^2} + C$

Proof
With a view to expressing the primitive in the form:
 * $\ds \int u \frac {\d v} {\d x} \rd x = u v - \int v \frac {\d u} {\d x} \rd x$

let:

and let:

Then:

Also see

 * Primitive of $x^2 \sinh a x$