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Consider the complex number z=(1-isin th...

Consider the complex number `z=(1-isin theta)/(1+icos theta)`
The value of `theta` for nuber z is purely real is

A

`npi-(pi)/(4),nin I`

B

`npi+(pi)/(4),nin I`

C

`npi,nin I`

D

none of these

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The correct Answer is:
A
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