Huang Cervantes
07/16/2024 · High School
Si \( f \) es continua sobre \( [0, \pi] \), utilice la sustitución \( u=\pi-x \) para demostrar que \[ \int_{0}^{\pi} x f(\operatorname{sen} x) d x=\frac{\pi}{2} \int_{0}^{\pi} f(\operatorname{sen} x) d x \] Tener en cuenta que \( \int_{a}^{b} f(x) d x=\int_{a}^{b} f(u) d u \)
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Para demostrar la igualdad, se usa la sustitución \( u = \pi - x \) y se muestra que
\[
\int_{0}^{\pi} x f(\sin x) \, dx = \frac{\pi}{2} \int_{0}^{\pi} f(\sin x) \, dx.
\]
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