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cos 2 alpha =(3 cos 2 beta -1)/( 3-cos 2...

`cos 2 alpha =(3 cos 2 beta -1)/( 3-cos 2 beta),` then `tan alpha=`

A

`tan beta`

B

`2 tan beta`

C

`sqrt2 tan beta`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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