If xsin^3theta+ycos^3theta-sinthetacosth...

If `xsin^3theta+ycos^3theta-sinthetacosthetaa n dxsintheta=ycostheta,` prove that `x^2+y^2=1`

A

`1`

B

`(3)/(2)`

C

`(1)/(2)`

D

`0`

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