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1. If f(z) = 2. If f(z) = z/z - 2, then f has a simple pole at z = 2. 3. If f(z) = (cos z - 1)/z , then f has a removable singularity at z = 0. 4. The residue of f(z) =
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1. If f(z) = 2. If f(z) = z/z - 2, then f has a simple pole at z = 2. 3. If f(z) = (cos z - 1)/z , then f has a removable singularity at z = 0. 4. The residue of f(z) =
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anzn + 
bnz-n then 
at z = 3 is 2/3.