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If cos theta=cos alpha cos beta, then ta...

If `cos theta=cos alpha cos beta`, then `tan((theta+alpha)/2) tan( (theta-alpha)/2) is equal to

A

`tan^2 alpha/2`

B

`tan^2 beta/2`

C

`tan^2 theta/2`

D

`cot^2 beta/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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