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If x=2at^2,y=at^4, then (d^2y)/(dx^2) at...

If `x=2at^2,y=at^4`, then `(d^2y)/(dx^2)` at `t=2` is

A

4

B

`2a`

C

`1/(2a)`

D

`-1/(2a)`.

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