(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

how to compute the residue of 1/(cosh(z)^n) at z=ipi/2?

2. Relevant equations

b]3. The attempt at a solution[/b]

i tried to use cosh(z)=-isinh(z-ipi/2) and taylor expantion of this.then from expantion of 1/(1+z) and some algebraic manipulations i tried identifying the residue.it didn't realy worked

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: I tried identifying the residue

**Physics Forums | Science Articles, Homework Help, Discussion**