यदि $\tan ^{-1}\left(\frac{1-x}{1+x}\right)=\frac{1}{2} \tan ^{-1} x$ है,तो $x$ का मान ज्ञात कीजिए।

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

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