જો $0 < x < 1$ હોય,તો $\cot ^{-1}\left( \frac{2x^2 - 1}{2x\sqrt{1 - x^2}} \right)$ ની કિંમત શોધો.

  • A
    $2\cot ^{-1}x$
  • B
    $\pi - 2\cos ^{-1}x$
  • C
    $2\cos ^{-1}x$
  • D
    $2\cos ^{-1}x - \pi$

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