$\int_{\pi / 6}^{\pi / 3} \cos^{-4} x \, dx =$

  • A
    $\frac{64}{9 \sqrt{3}}$
  • B
    $\frac{52 \sqrt{3}}{9}$
  • C
    $\frac{62 \sqrt{3}}{9}$
  • D
    $\frac{44}{9 \sqrt{3}}$

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