यदि $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ और $4x^2 = \frac{a}{b}$ है,तो $a + b =$

  • A
    $12$
  • B
    $11$
  • C
    $31$
  • D
    $10$

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