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If x=a t^2,y=2a t , then (d^2y)/(dx^2) ...

If `x=a t^2,y=2a t ,` then `(d^2y)/(dx^2)` is equal to (a)`-1/(t^2)` (b) `1/(2a t^2)` (c) `-1/(t^3)` (d) `1/(2a t^3)`

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