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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

`cos.(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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