यदि $x=a(1-\cos \theta)$ और $y=a(\theta+\sin \theta)$ है,तो $\frac{dy}{dx} =$ . . . . . .

  • A
    $\cot \theta$
  • B
    $\tan \theta$
  • C
    $\cot \frac{\theta}{2}$
  • D
    $\tan \frac{\theta}{2}$

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यदि $x=a(\cos t+t \sin t)$ और $y=a(\sin t-t \cos t)$ है,तो $\sqrt{(\frac{dx}{dt})^2+(\frac{dy}{dt})^2}=$

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