Worked example - a contour integral and a branch cut to find a real integral.

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Sorry if its a trivial question but why does the range for arg(z) start at -pi/2 and end at (3/4)pi?

hazzarious
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Sir, How to integrate a function like a log(z)*log(z-a) which has two branch-cuts along the contour |z|=1, such that |a|<1? I am stuck on it for a while now!

rajshikhargupta