If `x=sint,y=sinkt(k ne0`, constant) then show that `(1-x^2)(d^2y)/(dx^2)-x(dy)/(dx)+k^2y=0`.

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If `x=sint,y=sinkt(k ne0`, constant) then show that `(1-x^2)(d^2y)/(dx^2)-x(dy)/(dx)+k^2y=0`.
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