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The analytic function text f left( text z right) = frac...

This question belongs to Engineering Maths Complex Variable
Complex Variable
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The analytic function $${\text{f}}\left( {\text{z}} \right) = \frac{{{\text{z}} - 1}}{{{{\text{z}}^2} + 1}}$$   has singularities at

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Correct Answer: Option D
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