# Thread: Help in finding the Laurent Series in a given annulus

1. ## Help in finding the Laurent Series in a given annulus

Let $f(z) =\frac{z}{(1-z)\sin z}$. Find the Laurent series of $f(z)$ such that the series is valid in the annulus $\pi<|z|<2\pi$

How do I start? Thanks in advance!

2. ## Re: Help in finding the Laurent Series in a given annulus

A suggestion is attached.