If $x = \frac{3at}{1 + t^3}$ and $y = \frac{3at^2}{1 + t^3}$,then $\frac{dy}{dx} = $

  • A
    $\frac{t(2 + t^3)}{1 - 2t^3}$
  • B
    $\frac{t(2 - t^3)}{1 - 2t^3}$
  • C
    $\frac{t(2 + t^3)}{1 + 2t^3}$
  • D
    $\frac{t(2 - t^3)}{1 + 2t^3}$

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