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

If `cos theta = cos alpha cos beta, "then 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)`

Verified by Experts

The correct Answer is:

B

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