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

  • A
    $\frac{\sqrt{3}}{2\sqrt{7}}$
  • B
    $\frac{\sqrt{3}}{\sqrt{7}}$
  • C
    $\frac{\sqrt{2}}{\sqrt{5}}$
  • D
    $\frac{\sqrt{3}}{2\sqrt{5}}$

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