Update textbook.fr.md

00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/10.vector-analysis/main/textbook.fr.md

@@ -711,8 +711,8 @@ $`(\overrightarrow{U},\overrightarrow{V},\overrightarrow{W})
 
 $`(\overrightarrow{U},\overrightarrow{V},\overrightarrow{W})
 =-\,(\overrightarrow{V},\overrightarrow{U},\overrightarrow{W})
-=-(\overrightarrow{U},\overrightarrow{W},\overrightarrow{V})
-=-(\overrightarrow{W},\overrightarrow{V},\overrightarrow{U})`$
+=-(\overrightarrow{U},\overrightarrow{W},\overrightarrow{V})`$
+$`=-(\overrightarrow{W},\overrightarrow{V},\overrightarrow{U})`$
 
 --------------------------------------------------------------------------------
 
@@ -735,7 +735,7 @@ $`\vec{U}`$, $`\vec{V}`$ et $`\vec{W}`$ ordonnés en colonne :
 
 $`(\vec{U},\vec{V},\vec{W})=\begin{vmatrix} U_1 & U_2 & U_3\\
 V_1 & V_2 & V_3\\W_1 & W_2 & W_3\end{vmatrix}`$
-$`=U_3 V_1 W_2 + U_1 V_2 W_3 + U_2 V_3 W_1 - U_2 V_1 W_3 - U_3 V_2 W_1 - U_1 V_3 W_2`$
+$`=U_3 V_1 W_2 + U_1 V_2 W_3 + U_2 V_3 W_1 - U_2 V_1 W_3 `$$`\;- U_3 V_2 W_1 `$$`\;- U_1 V_3 W_2`$
 
 * *MATO3-VA-321*