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

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

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