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

The real value of `alpha` for which the expression `(1-sin alpha)/(1+2i sin alpha)` is purely real is

A

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

B

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

C

`npi`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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