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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જો $x=\sec \theta-\cos \theta$,$y=\sec ^{10} \theta-\cos ^{10} \theta$ અને $(x^2+4)(\frac{dy}{dx})^2=k(y^2+4)$ હોય,તો $k=$

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$x=\cos ^{-1}\left(\frac{1}{\sqrt{1+t^2}}\right), y=\sin ^{-1}\left(\frac{t}{\sqrt{1+t^2}}\right) \Rightarrow \frac{d y}{d x}$ ની કિંમત શોધો.

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