$\int_{0}^{\frac{\pi}{4}} \frac{\sin x+\cos x}{9+16 \sin 2 x} d x=k \log 3$,તો $k=$

  • A
    $\frac{1}{30}$
  • B
    $\frac{1}{20}$
  • C
    $\frac{1}{10}$
  • D
    $\frac{1}{40}$

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