Q .     If `x=at^2, y=2at`, then `\frac{d^2y}{dx^2}` is equal to:

BITSAT 2012
A

` -\frac{1}{t^2}`

B

` -\frac{1}{2at^3}`

C

`\frac{1}{t^2}`

D

`-\frac{a}{2t^2}`

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