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If theta in RR and (1 +i cos theta)/(1-...

If `theta in RR` and `(1 +i cos theta)/(1-2 i cos theta)` is real number, then `theta` will be (when I : Set of integers)

A

`(2n+1)(pi)/(2), n in I`

B

`(3n pi)/(2), n in I`

C

`n pi, n in I`

D

`2n pi, n in I`

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