જો $\sqrt{r} = a e^{\theta \cot \alpha}$ જ્યાં $a$ અને $\alpha$ વાસ્તવિક સંખ્યાઓ હોય,તો $\frac{d^{2} r}{d \theta^{2}} - 4 r \cot^{2} \alpha$ ની કિંમત શું થાય?

  • A
    $r$
  • B
    $\frac{1}{r}$
  • C
    $1$
  • D
    $0$

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