Nunez Whittaker
07/08/2023 · Junior High School

cice 2. On pose \( f_{n}(x)=\frac{x^{n}}{n^{4}\left(1+x^{n}\right)} \) pour \( n \geq 1 \) et \( x \in[0,1] \). Etudier la convengence simple puis normale et cette série de fonctions (0 Montrer que sa somme \( S \) est dérivable sur \( [0,1] \) et écrire sa dérivée. Pour \( x \in[0,1] \), on pose \( g_{n}(x)=\int_{0}^{x} f_{n}(t) d t \). Montrer que la série de fo est uniformément convergente sur \( [0,1] \) et que sa somme est une fonction roissante.

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La série \( f_n(x) = \frac{x^n}{n^4(1+x^n)} \) converge simplement et uniformément vers 0 sur \( [0, 1] \). La somme \( S(x) \) est dérivable et sa dérivée est 0. La série \( g_n(x) = \int_{0}^{x} f_n(t) dt \) converge uniformément sur \( [0, 1] \) et est une fonction croissante.

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