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

  • A
    $\tan (t/2)$
  • B
    $\cot (t/2)$
  • C
    $\tan 2t$
  • D
    $\tan t$

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જો $x = a \cos \theta$ અને $y = a \sin \theta$ હોય,તો $\frac{d^2 y}{d x^2} =$ . . . . . . . (જ્યાં $a \neq 0$ અને $\theta \neq k \pi, k \in Z$)

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