यदि $x = at^2$ और $y = 2at$ है, तो $\frac{d^2y}{dx^2} = \dots$

  • A
    $-\frac{a}{xy}$
  • B
    $\frac{a}{xy}$
  • C
    $\frac{ax}{y}$
  • D
    $-\frac{ax}{y}$

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