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

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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
 
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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
 

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