જો $x=a(t+\sin t)$ અને $y=a(1-\cos t)$ હોય,તો $\frac{d^2 y}{d x^2}$ શોધો.

  • A
    $\frac{1}{4 a \sin ^4(\frac{t}{2})}$
  • B
    $\frac{1}{4 a \cos ^4(\frac{t}{2})}$
  • C
    $4 a \operatorname{cosec}^4(\frac{t}{2})$
  • D
    $4 a \sec ^4(\frac{t}{2})$

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