यदि xsintheta=ycostheta=(2ztantheta)/(1-...

यदि `xsintheta=ycostheta=(2ztantheta)/(1-tan^(2)theta)` तब `4z^(2)(x^(2)+y^(2))=`

A

`(x^(2) + y ^(2)) ^(3)`

B

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

C

`(x ^(2) - y ^(2)) ^(3)`

D

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

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