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The real part of (1-costheta + I sin the...

The real part of `(1-costheta + I sin theta)^(-1)` is

A

`(1)/(2)`

B

`(1)/(1+costheta)`

C

`tan""(theta)/(2)`

D

`cot""(theta)/(2)`

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The correct Answer is:
A
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