$\int_{\frac{\pi}{4}}^{\frac{\pi}{2}} \cot ^9 x \, dx =$

  • A
    $\frac{-7}{24} + \frac{1}{2} \log 2$
  • B
    $\frac{7}{24} - \frac{1}{2} \log 2$
  • C
    $\frac{25}{24} + \frac{1}{2} \log 2$
  • D
    $\frac{1}{24} + 2 \log 2$

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