If (costheta+isintheta)(cos2theta+isin2t...

If `(costheta+isintheta)(cos2theta+isin2theta)…......(cosntheta+isinntheta) = 1`, then the value of `theta` is

A

`A.4mpi`

B

`B.frac{2mpi}{n(n+1)`

C

`C.frac{4mpi}{n(n+1)}`

D

`D.frac{mpi}{n(n+1)}`

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