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

Hey guys.

I need to show that this function has an essential singularity at z=0.

I used Taylor series to get what I got, which is a series inside a series...

And I can't see how am I suppose to show it from here.

Any ideas guys?

Thanks.

2. Relevant equations

3. The attempt at a solution

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# Essential singularity

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