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Consider likely applicability of Cauchy's Integral Theorem to evaluate the following...

This question belongs to Engineering Maths Complex Variable
Complex Variable
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Consider likely applicability of Cauchy's Integral Theorem to evaluate the following integral counter clockwise around the unit circle c.
$$I = \oint\limits_{\text{c}} {\sec {\text{z}}} {\text{dz,}}$$   z being a complex variable. The value of $$I$$ will be

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Correct Answer: Option A
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