If cosx=3cosy, then 2tan.(y-x)/(2) is eq...

If `cosx=3cosy`, then `2tan.(y-x)/(2)` is equal to

A

`cot ((y-x)/(2))`

B

`cot ((x+y)/(4))`

C

`cot ((y-x)/(4))`

D

`cot ((x+y)/(2))`

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The correct Answer is:

D

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