If cosx-sinalphacotbetasinx=cosa , then ...

If `cosx-sinalphacotbetasinx=cosa ,` then the value of `tan(x/2)` is

A

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

B

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

C

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

D

None of these

Verified by Experts

The correct Answer is:

B

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