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I have a problem in general finding the region in which the Laurent series converges...

Could someone please help me with this question - I know that this is is meant to be easy (as there is no fully worked solution to this) but I dont understand it:

f(z) = 1/ [(z^3)*cosz]. The function has a Laurent series about z = 0 converging at Pi/4. What is the region in which this Laurent series converges?

Thanks.

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# Laurent series

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