यदि $\tan^{-1} 2x + \tan^{-1} 3x = \frac{\pi}{4}$ है,तो $x =$

  • A
    $-1$
  • B
    $\frac{1}{6}$
  • C
    $-1, \frac{1}{6}$
  • D
    इनमें से कोई नहीं

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