$\int_0^{\pi / 4} \frac{x^2}{(x \sin x+\cos x)^2} d x=$

  • A
    $\frac{2-\pi}{2+\pi}$
  • B
    $\frac{4-\pi}{4+\pi}$
  • C
    $\frac{6-\pi}{6+\pi}$
  • D
    $\frac{8-\pi}{8+\pi}$

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