ધારો કે $S$ એ સમીકરણ $\cos ^{-1}(2 x)-2 \cos ^{-1}\left(\sqrt{1-x^2}\right)=\pi$ ના તમામ ઉકેલોનો ગણ છે,જ્યાં $x \in\left[-\frac{1}{2}, \frac{1}{2}\right]$. તો $\sum_{x \in S} 2 \sin ^{-1}\left(x^2-1\right)$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $-\frac{2 \pi}{3}$
  • C
    $\pi-\sin ^{-1}\left(\frac{\sqrt{3}}{4}\right)$
  • D
    $\pi-2 \sin ^{-1}\left(\frac{\sqrt{3}}{4}\right)$

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