Given that cos ((alpha -beta)/(2)) = 2 c...

Given that `cos ((alpha -beta)/(2)) = 2 cos ((alpha+ beta)/(2)),` then ` tan ""(alpha)/(2) tan ""(beta)/(2)` is equal to

A

`1//2`

B

`1//3`

C

`1//4`

D

`1//8`

Verified by Experts

The correct Answer is:

B

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