I keep messing up the algebra for this integral

by Mike Furson   Last Updated May 16, 2019 04:20 AM

So the question is here Contour Integral enter image description here

and for whatever reason I am constantly for part a) getting -3 times the answer, and I can't figure out where I'm going wrong

Here's my working My Working for integral enter image description here

It's driving me insane trying to find the mistake, could someone pls help me find it?

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