$\int_0^{\frac{\pi}{6}} (2+3x^2) \cos 3x \, dx =$

  • A
    $\frac{2}{9} + \frac{\pi^2}{36}$
  • B
    $\frac{4}{9} + \frac{\pi^2}{36}$
  • C
    $\frac{2}{9} - \frac{\pi^2}{36}$
  • D
    $\frac{4}{9} - \frac{\pi^2}{36}$

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