Contour Integrals, which contour to use?

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SUMMARY

The discussion centers on the selection of contours for evaluating contour integrals, specifically in the context of applying the residue theorem. Participants clarify that there are no universal rules for contour selection; it is contingent upon the specific integral being evaluated. The conversation emphasizes the importance of understanding the integral's characteristics to determine the appropriate path. The inquiry also highlights the need for clarity in the approach taken for specific integrals.

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Homework Statement


http://img404.imageshack.us/img404/3952/contf.png


The Attempt at a Solution


Is there a set of rules or postulate that refer to which contour to use for specific integrals?
I tried to use the residue theorem for the first integral but I didn't get the right answer
 
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No, there is no general rule, but it depends entirely on the integral which path to chose.
What have you done exactly for a)? Which path did you chose and what result did you get?
 

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