If tan^2theta=2tan^2varphi+1,t h e ncos2...

If `tan^2theta=2tan^2varphi+1,t h e ncos2theta+sin^2varphi` equals (a) -1` (b) 0 (c) 1 (d) none of these

A

`-1`

B

0

C

1

D

2

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The correct Answer is:

B

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