# Decompose into simple fractions over \$mathbb{C}\$

Decompose into simple fractions over $$mathbb{C}$$:

$$f(x) = frac{1}{(x^2-1)^n}$$.

I know how to decompose some fractions by $$mathbb{R}$$, but I have no idea how analyze this over $$mathbb{C}$$ and solve dependency from $$n$$.