diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.fr.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.fr.md
index bd999537d..2c1d15bdc 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.fr.md
@@ -54,8 +54,8 @@ Les *outils mathémétiques de niveaux 1 et 2* **$`+`$** :
 
 * notations réelle et notation complexe : 
 **$`\overrightarrow{U}=U_0\,\cos(k\,x-\omega t+\varphi)\overrightarrow{e}`$**   
-**$`\overrightarrow{\underline{U}}=U_0\,e^{\,i\,(k\,x-\omega t+\varphi)}\overrightarrow{e}`$** 
-$`\overrightarrow{\underline{U}}=\underline{U_0}\,e^{\,i\,(k\,x-\omega t)}\overrightarrow{e}`$   
+**$`\overrightarrow{\underline{U}}=U_0\,e^{\,i\,(k\,x-\omega t+\varphi)}\overrightarrow{e}`$**
+**$`\;=\underline{U_0}\,e^{\,i\,(k\,x-\omega t)}\overrightarrow{e}`$**       
 **$`\overrightarrow{U}=\mathcal{Re}(\overrightarrow{\underline{U}})`$**
 
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