if x=acostheta+bsintheta and y=asintheta-bcostheta then prove that y 2 d 2y/dx^2 xdy/dx + y = 0? How can I prove this math problem?

if x=acostheta+bsintheta and y=asintheta-bcostheta then prove that y 2 d 2y/dx^2 xdy/dx + y = 0? How can I prove this math problem?

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