$\cot ^{-1}\left(\frac{\sqrt{1+x^2}-1}{x}\right) = $ . . . . . .

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

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