समीकरण $\tan^{-1}(1 + x) + \tan^{-1}(1 - x) = \frac{\pi}{2}$ का एक हल है

  • A
    $x = 1$
  • B
    $x = -1$
  • C
    $x = 0$
  • D
    $x = \pi$

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