The integral \(\int^\pi_{0} xf(sin x)dx\) equals

1
\(\pi\int^\pi_{0} f(sin x)dx\)
2
\(\frac{\pi}{2}\int^\pi_{0} f(sin x)dx\)
3
\(\frac{\pi}{2}\int^{\pi/2}_{0} f(sin x)dx\)
4
\(\pi\int^\pi_{0} f(cos x)dx\)

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