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Let y(x)=cos(3cos^-1x),x in [-1,1],x != ...

Let `y(x)=cos(3cos^-1x),x in [-1,1],x != +- sqrt3/2.` Then `1/(y(x)){(x^2-1)(d^2y(x))/(dx^2)+x(dy(x))/(dx)}` equals

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