यदि ${\tan ^{ - 1}}\frac{{1 - x}}{{1 + x}} = \frac{1}{2}{\tan ^{ - 1}}x$ है,तो $x = $

  • A
    $1$
  • B
    $\sqrt{3}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    इनमें से कोई नहीं

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