If theta in R and frac{1-icostheta}{1+2i...

If `theta in R` and `frac{1-icostheta}{1+2icostheta}` is real number, then `theta` will be (when `I`:Set of integers)

A

`A.(2n+1)frac{pi}{2}, n in I`

B

`B.frac{3npi}{2}, n in I`

C

`C.npi, n in I`

D

`D.2npi, n in I`

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