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If tan^2alpha-2tan^2beta=1 then which of...

If `tan^2alpha-2tan^2beta=1` then which of the following options is correct?

A

`2cos2beta - cos2alpha=1`

B

`cos2alpha-2cos2beta=1`

C

`2cos2alpha-cos2beta=-1`

D

`cos2beta-2cos2alpha=-1`

Text Solution

Verified by Experts

The correct Answer is:
C
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