જો $a \neq 0$ માટે,$x = a(1 - \sin t)$ અને $y = a(t + \cos t)$ હોય,તો $\frac{d^2 y}{d x^2} = $

  • A
    $\frac{1 - \sin t}{a \cos^2 t}$
  • B
    $\frac{1}{4a} \operatorname{cosec}^4\left(\frac{t}{2}\right)$
  • C
    $\frac{\sin t - 1}{a \cos^3 t}$
  • D
    $\frac{1}{4a} \sec^4\left(\frac{t}{2}\right)$

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