If $\tan ^{-1}\left(\frac{1-x}{1+x}\right)-\frac{1}{2} \tan ^{-1} x=0$,for $x>0$,then $x=$

  • A
    $\sqrt{3}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    $\frac{1}{3}$

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