જો $2 \cos \left(2 \tan ^{-1} x\right)=1$ હોય,તો $x=$ . . . . . .

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

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