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If cos x-sin alpha cot beta sin x=cos al...

If `cos x-sin alpha cot beta sin x=cos alpha`, then the vlaue 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

Text Solution

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The correct Answer is:
B
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