1.

If xcostheta+ysintheta=4&xcostheta-ysintheta=0, then which one is correct?

Answer»

`x^(2)+y^(2)=4`
`x^(2)+y^(2)=16`
`(1)/(x^(2))+(1)/(y^(2))=(1)/(4)`
`(1)/(x^(2))+(1)/(y^(2))=4`

ANSWER :A::D


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