$\tan^{-1} \left[ \frac{\sqrt{1+x^2} + \sqrt{1-x^2}}{\sqrt{1+x^2} - \sqrt{1-x^2}} \right] = $

  • A
    $\frac{\pi}{4} + \frac{1}{2} \cos^{-1} x^2$
  • B
    $\frac{\pi}{4} + \cos^{-1} x^2$
  • C
    $\frac{\pi}{4} + \frac{1}{2} \cos^{-1} x$
  • D
    $\frac{\pi}{4} - \frac{1}{2} \cos^{-1} x^2$

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