Ok, here is the question(adsbygoogle = window.adsbygoogle || []).push({});

determine whether f(z)=(1+z)/(1-z) is analytic or otherwise. Unfortunetly I am having problems with the maths. So far I have substituted z=x+iy and got

1+x-iy/1-x-iy and if i let a=x+1 and b=1-x then that simplifies my problem to

a+iy/b-iy

so now i have to rearrange this fraction so that i have a term with i and a term without.

For the life of me I can't figure out how to actually do that

Any help would be much appreciated

Leila

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# Complex fuction - is it analytic

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