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If sqrt((1+cosA)/(1-cosA))=(x)/(y), the...

If `sqrt((1+cosA)/(1-cosA))=(x)/(y)`, then the value of tan A =

A

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

B

`(x^(2)+y^(2))/(x^(2)-y^(2))`

C

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

D

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

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