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

यदि `sintheta = (x^(2) - y^(2))/(x^(2) + y^(2))` है, तो निम्नलिखित में से कौन-सा एक सही है?

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))`

लिखित उत्तर

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