यदि cottheta=(2xy)/(x^2-y^2) हो, तो cos...

यदि cot`theta=(2xy)/(x^2-y^2)` हो, तो cos`theta` किसके हे बराबर है?

A

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

B

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

C

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

D

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

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