$\int\limits_0^{\frac{\pi }{4}} (\cos 2x)^{3/2} \cos x \,dx =$

  • A
    $\frac{3\pi}{16}$
  • B
    $\frac{3\pi}{32}$
  • C
    $\frac{3\pi}{16\sqrt{2}}$
  • D
    $\frac{3\pi\sqrt{2}}{16}$

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