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Topic: residue at z=0 for sinh(z)*cosh(1/z) ?
Replies: 1   Last Post: May 4, 2013 10:21 AM

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Robin Chapman

Posts: 412
Registered: 5/29/08
Re: residue at z=0 for sinh(z)*cosh(1/z) ?
Posted: May 4, 2013 10:21 AM
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On 04/05/2013 15:09, Brad Cooper wrote:
> Puzzled by this...
> residue at z=0 for sinh(z)*cosh(1/z) ?
> Cannot obtain Laurent series.

You only need one term...

> Nothing else works either.

I get sum_{n=1}^infinity 1/((2n-1)!(2n)!).

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