1. The problem statement, all variables and given/known data Determine the location and type of singularity of f(z) = 1/sin^2(z) 2. Relevant equations 3. The attempt at a solution I'm not really sure how to calculate this. At this point, we don't have explicit formulae for the coefficients of a Laurent series so I really don't know what to do. Taylor series? Any help would be much appreciated. Thanks.