જો $x = a \cos \theta$ અને $y = a \sin \theta$ હોય, તો $\frac{d^2 y}{d x^2} = \rule{1cm}{0.15mm} \, (a \neq 0; \theta \neq k\pi, k \in Z)$ શોધો.

  • A
    $-\frac{1}{a} \csc^3 \theta$
  • B
    $-\frac{1}{a} \csc^3 \theta \cdot \sec \theta$
  • C
    $\frac{1}{a} \cot^3 \theta$
  • D
    $\csc^2 \theta$

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