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Someone please help me with this Laurent Expansion

  1. Oct 27, 2014 #1
    1. The problem statement, all variables and given/known data
    the Laurent expansion of f(z)=e1/sin(z) at the isolated singularity z=π

    2. Relevant equations


    3. The attempt at a solution
    I tried rewriting 1/sin(z) into exponential form, but it seems have no help for the expansion. Would someone give me some inspirations?
     
  2. jcsd
  3. Oct 27, 2014 #2

    RUber

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    Can you remove the singularity?
     
  4. Oct 28, 2014 #3
    Actually, the singularity here is an essential singularity, which is not removable I think.
     
  5. Oct 29, 2014 #4

    RUber

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  6. Oct 29, 2014 #5
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