find the residue of exp (iaz) / (cosh (pi z))^2 at z= i/2. what i did was to differentiate exp (iaz) at z= i/2 but the answer seems to say that i need to differentiate exp (iaz) / (cosh (pi z))^2. may i know why?
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I would actually say "neither". It looks like you have a second-order pole at the point of interest, in which case you should do this. Make sense?
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