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IF tan^2 theta=2 tan^2 phi +1 then find ...

IF `tan^2 theta=2 tan^2 phi +1` then find the value of `cos 2 theta+sin^2 phi`.

A

`2 cos (alpha)/(2)`

B

`2 sin (alpha)/(2)`

C

2

D

none of these

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The correct Answer is:
D
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