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If cosx-sinalphacotbetasinx=cosalpha,the...

If `cosx-sinalphacotbetasinx=cosalpha,then tan""(x)/(2)` is equal to

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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