Primitive of Reciprocal of x by Power of x minus Power of a

Theorem

 * $\displaystyle \int \frac {\mathrm d x} {x \left({x^n - a^n}\right)} = \frac 1 {n a^n} \ln \left\vert{\frac {x^n - a^n} {x^n} }\right\vert + C$