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The real value of theta for which the ex...

The real value of `theta` for which the expression `(1 + icos theta)/(1 - 2i cos theta)` is real number is

A

`npi + (pi)/(4)`

B

`mx + (-1)^(n) (pi)/(4)`

C

`2npi pm (pi)/(2)`

D

None of these

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