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If sintheta = (x^(2) - y^(2))/(x^(2) + y...

If `sintheta = (x^(2) - y^(2))/(x^(2) + y^(2))`, then which one of the following is correct?

A

`cos theta = (2xy)/(x^(2)- y^(2))`

B

`cos theta = (2xy)/(x^(2) + y^(2))`

C

`cos theta = (x-y)/(x^(2) + y^(2))`

D

`cos theta = (xy(x-y))/(x^(2) + y^(2))`

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