- #1

Void123

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## Homework Statement

I am trying to understand Laurent series from the few and limited examples given by my texts.

I understand the basic idea, which is to expand the series about a function's pole.

So how would one go about finding the Laurent expansion for [tex]\frac{z + 1}{z^{2} - z - 6}[/tex]?

Or [tex]\frac{cosh z}{z^{2}}[/tex]?

## Homework Equations

[tex]f(z) = \sum a_{n} (z - z_{0})^{n}[/tex]

## The Attempt at a Solution

Pretty straightforward equation. Except, could someone explain the procedure of calculating [tex]a_{n}[/tex]

Thanks.