Update textbook.fr.md

01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/02.electromagnetic-waves-vacuum/02.electromagnetic-waves-vacuum-main/textbook.fr.md

@@ -222,11 +222,10 @@ Jean & 12,3 & Admis\\
 
 Onde EM plane progressive :<br>
 $`\Longleftrightarrow 
-\left \{
+\left \|
    \begin{array}{r c l}
-      AB  & = & 192 \\
-      C   & = & 5\,896 \\
-      DEF & = & 0,5
+      \overrightarrow{E}(\overrightarrow{r},t)=\overrightarrow{E}(\overrightarrow{u}\cdot\overrightarrow{r}-ct) \\
+      \overrightarrow{B}(\overrightarrow{r},t)=\overrightarrow{B}(\overrightarrow{u}\cdot\overrightarrow{r}-ct) \\
    \end{array}
    \right .`$