Here's a link to a professor's notes on a contour integration example.(adsbygoogle = window.adsbygoogle || []).push({});

https://math.nyu.edu/faculty/childres/lec12.pdf

I don't understand where the ##e^{i\pi /2} I## comes from in the first problem. It seems like it should be ##e^{i\pi}## instead since ##-C_3## and ##C_1## are both on the real line.

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# Complex Analysis: Contour Integral

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