If x=a(costheta+thetasintheta) , y=a(sin...

If `x=a(costheta+thetasintheta)` , `y=a(sintheta-thetacostheta)` , prove that `(d^2x)/(d theta^2)=a(costheta-thetasintheta)`,\ `(d^2y)/(d theta^(2))=a(sintheta+thetacostheta)` and `(d^2y)/(dx^2)=(s e c^3theta)/(a\ theta)` .

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