Primitive of Reciprocal of x by x squared plus a squared/Proof 3

Proof
From Primitive of Reciprocal of x by Power of x plus Power of a:
 * $\ds \int \frac {\d x} {x \paren {x^n + a^n} } = \frac 1 {n a^n} \ln \size {\frac {x^n} {x^n + a^n} } + C$

So: