સમીકરણ $\tan ^{-1}(1+x)+\tan ^{-1}(1-x)=\frac{\pi}{2}$ નો ઉકેલ શોધો.

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

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