$\int \sqrt{2 + \sin 3x} \cdot \cos 3x \, dx = $

  • A
    $\frac{2}{9}(2 + \sin 3x)^{1/2} + c$
  • B
    $\frac{2}{3}(2 + \sin 3x)^{2/3} + c$
  • C
    $\frac{2}{3}(2 + \sin 3x)^{3/2} + c$
  • D
    $\frac{2}{9}(2 + \sin 3x)^{3/2} + c$

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