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

`"cot"(beta)/(2)"tan"(alpha)/(2)`

B

`tan alpha "tan"(beta)/(2)`

C

`"tan"(beta)/(2)"cot" (alpha)/(2)`

D

`"tan"^(2) (alpha)/(2) "tan"^(2) (beta)/(2)`

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The correct Answer is:

A

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