Pena King
03/15/2023 · Junior High School
3. Considere la siguiente función \[ f(x)=\left\{\begin{array}{ll}x^{2} \operatorname{sen}\left(\frac{1}{x}\right) & \text { si } x \neq 0 \\ 0 & \text { si } x=0\end{array}\right. \] Demuestre que existe \( c \in(-\pi, \pi) \) tal que \( f(c)=1 \) Pista: Para mostrar la continuidad en \( x=0 \), use que \( \left|\operatorname{sen}\left(\frac{1}{x}\right)\right| \leq 1 \)
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Para demostrar que existe \( c \in (-\pi, \pi) \) tal que \( f(c) = 1 \), se utiliza la propiedad de que \( \left|\operatorname{sen}\left(\frac{1}{x}\right)\right| \leq 1 \). Dado que \( x^2 \) es positivo en el intervalo, se puede encontrar un valor de \( c \) en \((- \pi, \pi)\) para el que \( f(c) = 1 \).
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