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If x=varphi(t), y=psi(t),t h e n(d^(2y))...

If `x=varphi(t), y=psi(t),t h e n(d^(2y))/(dx^2)` is (a)`(varphi^(prime)psi^('')-psi'varphi' ')/((varphi^(prime))^2)` (b) `(varphi^(prime)psi^('')-psi'varphi' ')/((varphi^(prime))^3)` (c)`varphi^('')/psi^('')` (d) `psi^('')/varphi^('')`

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