$\int_0^{\frac{\pi}{4}} x \sec^2 x \, dx =$

  • A
    $\frac{\pi}{4} + \log \sqrt{2}$
  • B
    $\frac{\pi}{4} - \log \sqrt{2}$
  • C
    $1 + \log \sqrt{2}$
  • D
    $1 - \frac{1}{2} \log 2$

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