જો $x=a \cos ^{3} \theta$ અને $y=a \sin ^{3} \theta$ હોય,તો $\frac{d y}{d x}$ શું થાય?

  • A
    $\sqrt[3]{\frac{y}{x}}$
  • B
    $\sqrt[3]{\frac{x}{y}}$
  • C
    $-\sqrt[3]{\frac{x}{y}}$
  • D
    $-\sqrt[3]{\frac{y}{x}}$

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