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If cos x=3 cos y, then 2 tan ((y-x)/(2)...

If `cos x=3 cos y, ` then `2 tan ((y-x)/(2))=`............. A) `cot ((y-x)/(2))`
B) ` cot ((x+y)/(4))` C) `cot ((y-x)/(4))` D) `cot ((x+y)/(2))`

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
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