જો $\tan ^{-1} 2x + \tan ^{-1} 3x = \frac{\pi}{4}$ હોય,તો $x = $

  • A
    $-1$
  • B
    $\frac{1}{3}$
  • C
    $\frac{1}{6}$
  • D
    $\frac{1}{2}$

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