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The integral oint text f left( text z right) text dz...

This question belongs to Engineering Maths Complex Variable
Complex Variable
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The integral $$\oint {{\text{f}}\left( {\text{z}} \right){\text{dz}}} $$   evaluated around the unit circle on the complex plane for $${\text{f}}\left( {\text{z}} \right) = \frac{{\cos {\text{z}}}}{{\text{z}}}$$   is

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Correct Answer: Option A
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