Update textbook.fr.md

00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md

@@ -530,15 +530,8 @@ $`\quad=±,\begin{pmatrix}U_2 V_3 - U_3 V_2\\U_3 V_1 - U_1 V_3\\U_1 V_2 - U_2 V_
 [EN] method similar to the sum used to obtain the determinant of a matrix :<br>
 <br>$`\vec{U}\land\vec{V}=\begin{vmatrix} \overrightarrow{e_1}&\overrightarrow{e_2}&\overrightarrow{e_3}\\
 U_1 & U_2 & U_3\\V_1 & V_2 & V_3\end{vmatrix}`$
-$`=U_1V_1\overrightarrow{e_3}+U_2V_3\overrightarrow{e_1}+U_2V_3\overrightarrow{e_1}`$
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+$`=U_1V_1\overrightarrow{e_3}+U_2V_3\overrightarrow{e_1}+U_3V_1\overrightarrow{e_2}`$
+$`- U_1V_3\overrightarrow{e_2}-U_2V_1\overrightarrow{e_3}-U_3V_2\overrightarrow{e_1}`$