જો $\tan y = \frac{2t}{1 - t^2}$ અને $\sin x = \frac{2t}{1 + t^2}$ હોય,તો $\frac{dy}{dx} = $

  • A
    $\frac{2}{1 + t^2}$
  • B
    $\frac{1}{1 + t^2}$
  • C
    $1$
  • D
    $2$

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જો $x = a \cos^3 \theta$ અને $y = a \sin^3 \theta$ હોય,તો $\sqrt{1 + \left(\frac{dy}{dx}\right)^2}$ ની કિંમત શોધો.

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