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

  • A
    $\frac{y}{x}$
  • B
    $\frac{x}{2y}$
  • C
    $\frac{1}{t}$
  • D
    $\frac{x}{y}$

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