$\int_0^{\frac{\pi}{4}} \frac{\sec x}{1+2 \sin ^2 x} d x=$

  • A
    $\frac{1}{3} \log (\sqrt{2}+1)+\frac{\pi \sqrt{2}}{12}$
  • B
    $\frac{2}{3} \log (\sqrt{2}+1)+\frac{\pi \sqrt{2}}{6}$
  • C
    $\frac{1}{6} \log (\sqrt{2}-1)+\frac{\pi}{12}$
  • D
    $\frac{1}{4} \log (\sqrt{2}-1)-\frac{\pi \sqrt{3}}{6}$

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