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

  • A
    $\frac{1}{{36}}(\pi + 16)$
  • B
    $\frac{1}{{36}}(\pi - 16)$
  • C
    $\frac{1}{{36}}({\pi ^2} - 16)$
  • D
    $\frac{1}{{36}}({\pi ^2} + 16)$

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