यदि $\tan ^{-1}(2 x)+\tan ^{-1}(3 x)=\frac{\pi}{4}$,जहाँ $x>0$,तो $x=$

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

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