$\tan \left(2 \tan^{-1}\left(\frac{1}{3}\right)+\tan^{-1}\left(\frac{1}{7}\right)\right) = $

  • A
    $1$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    $\sqrt{3}$
  • D
    $3/7$

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