$\int \frac{dx}{4x^2 + 9} = $

  • A
    $\frac{1}{2} \tan^{-1} \left( \frac{2x}{3} \right) + c$
  • B
    $\frac{3}{2} \tan^{-1} \left( \frac{2x}{3} \right) + c$
  • C
    $\frac{1}{6} \tan^{-1} \left( \frac{2x}{3} \right) + c$
  • D
    $\frac{1}{6} \tan^{-1} \left( \frac{3x}{2} \right) + c$

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