If \( x=a t^{2}, y=2 a t \), then \( \frac{d^{2} y}{d x^{2}}= \) P ...

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If \( x=a t^{2}, y=2 a t \), then \( \frac{d^{2} y}{d x^{2}}= \)
P
(A) \( -\frac{1}{t^{2}} \)
(B) \( \frac{1}{2 a t^{3}} \)
(C) \( -\frac{1}{t^{3}} \)
(D) \( -\frac{1}{2 a t^{3}} \)
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