Consider the complex number z = (1 - isi...

Consider the complex number `z = (1 - isin theta)//(1+ icos theta)`.
The value of `theta` for which z is purely imaginary are

A

`npi-(pi)/(4)`

B

`npi+(pi)/(4)`

C

`npi`

D

None of these

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The correct Answer is:

D

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