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

  • A
    $\tan \frac{t}{2}$
  • B
    $-\frac{t}{2} \tan t$
  • C
    $\frac{1}{2} \tan t$
  • D
    $-\tan \frac{t}{2}$

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