Identify the singularity

1. Mar 22, 2008

mkbh_10

1. The problem statement, all variables and given/known data

Identify the singularity of f(z)= 1-e^z/1+e^z at z= infinity

2. Relevant equations

3. The attempt at a solution

How shud i start

2. Mar 22, 2008

CompuChip

You can convert the singularity at infinity to one at zero by considering
$g(z) = f(1 / z)$
Then apply the same strategy as here