If cos theta =(cos alpha - cos beta)/( 1...

If `cos theta =(cos alpha - cos beta)/( 1- cos alpha cos beta),` then one of the values of `tan ((theta )/(2)) `is

A

`+- tan ( alpha //2) tan ( beta //2)`

B

`+- tan ( alpha // 2 ) cot ( beta //2)`

C

`+- tan ( beta //2) cot ( alpha //2)`

D

none

Text Solution

Verified by Experts

The correct Answer is:

B

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