यदि ${\tan ^{ - 1}}(x - 1) + {\tan ^{ - 1}}x + {\tan ^{ - 1}}(x + 1) = {\tan ^{ - 1}}3x$ है,तो $x =$

  • A
    $ \pm \frac{1}{2} $
  • B
    $ 0, \frac{1}{2} $
  • C
    $ 0, - \frac{1}{2} $
  • D
    $ 0, \pm \frac{1}{2} $

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