$\int_{0}^{\pi} x f(\sin x) dx = $

  • A
    $\pi \int_{0}^{\pi} x f(\cos x) dx$
  • B
    $\pi \int_{0}^{\pi} f(\sin x) dx$
  • C
    $\frac{\pi}{2} \int_{0}^{\frac{\pi}{2}} f(\sin x) dx$
  • D
    $\pi \int_{0}^{\frac{\pi}{2}} f(\cos x) dx$

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