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If cos2theta=cot^(2)theta-tan^(2)theta ...

If `cos2theta=cot^(2)theta-tan^(2)theta` then `theta` =

A

`npi+-(pi)/(4)`

B

`npi+-(pi)/(6)`

C

`npi+-(pi)/(3)`

D

None of these

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The correct Answer is:
A
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