CVR9
From Exampleproblems
Find the residues of 
at all its isolated singular points and at infinity (if infinity is not a limit point of singular points), where is given by
This has poles at z = 2,.
Use the formula ![\mathrm{Res}_{z=z_0} f(z) = \frac{1}{(k-1)!}\lim_{z\to z_0} \frac{d^{k-1}}{{dz}^{k-1}}\left[(z-z_0)^k f(z)\right]\,](/wiki/images/math/f/d/e/fded86bdbecf9ea9fc9c85714763d2fa.png)
In this case infinity is a limit point of singular points, so there is no residue at infinity.
