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If x=acostheta and y=bsintheta , then b^...

If `x=acostheta` and `y=bsintheta` , then `b^2x^2+a^2y^2=`
(a)`a^2b^2`
(b) `a b`
(c) `a^4\ b^4`
(d) `a^2+b^2`

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