જો $x=a(\theta+\sin \theta)$ અને $y=a(1-\cos \theta)$ હોય,તો $\frac{dy}{dx} = $ . . . . . . .

  • A
    $\cot \frac{\theta}{2}$
  • B
    $\tan \frac{\theta}{2}$
  • C
    $\frac{1}{2} \cot \frac{\theta}{2}$
  • D
    $\frac{1}{2} \tan \theta$

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