Question

Asked Mar 23, 2019

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Z is a complex variable, z=x+iy

Question attached in photo

Step 1

To evaluate the given integral over three different given contours

Step 2

Points to note: (1) All the integrals have the same value ; (2) they can be evaluated simply by applying residue formula (no need to calculate in a tedious manner)

Step 3

All the three contours are sketched in the diagram. Note all of contain the point z=2 , which is the only pole for the integrand. As per Cauchy's residue formula , ...

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