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If the semi-circular contour D of radius 2 is as shown...

This question belongs to Engineering Maths Complex Variable
Complex Variable
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If the semi-circular contour D of radius 2 is as shown in the figure, then the value of the integral $$\oint\limits_{\text{D}} {\frac{1}{{\left( {{{\text{s}}^2} - 1} \right)}}{\text{ds}}} $$   is
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Correct Answer: Option A
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