Thornton Ruiz
04/02/2024 · Senior High School
Partie A: On considère la fonction \( \varphi \) définie sur \( \mathbb{R} \operatorname{par} \varphi(x)=e^{x}-x-1 \) 1. Etudier le sens de variation de la fonction \( \varphi \) 2. a) Quelle est la valeur du minimum de \( \varphi \operatorname{sur} \mathbb{R} \) ? b) En déduire le signe de \( \varphi(x) \) pour tout \( x \in e^{\prime}= \)
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La fonction \( \varphi(x) = e^x - x - 1 \) est décroissante sur \( (-\infty, 0) \) et croissante sur \( (0, +\infty) \). Son minimum est \( 0 \) en \( x = 0 \). Par conséquent, \( \varphi(x) \leq 0 \) pour tout \( x \in \mathbb{R} \).
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