यदि $x = at^2$ और $y = 2at$ है,तो $\frac{d^2 x}{dy^2}$ ज्ञात कीजिए।

  • A
    $-\frac{1}{2at^3}$
  • B
    $-2at^3$
  • C
    $-\frac{1}{2at^2}$
  • D
    $\frac{1}{2a}$

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