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If thetainRRand(1-icostheta)/(1+2icosthe...

If `thetainRRand(1-icostheta)/(1+2icostheta)` is real number, then `theta` will be (when I: set of integers)

A

`(2n+1)(pi)/(2),ninI`

B

`(3npi)/(2),ninI`

C

`npi,ninI`

D

`2npi,ninI`

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