What Type of Singularity Does f(z) = (1-e^z)/(1+e^z) Have at Infinity?

[mkbh_10]

Homework Statement

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

Homework Equations

The Attempt at a Solution

How shud i start

 

[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