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(cos x )/( cos (x-2y))= lambda implies t...

`(cos x )/( cos (x-2y))= lambda implies tan(x-y) tan y=`

A

`(1+ lambda)/(1-lambda) `

B

`(1- lambda)/(1+ lambda) `

C

`(lambda)/(1+ lambda)`

D

`(lambda)/(1- lambda ) `

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The correct Answer is:
B
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