Update textbook.fr.md

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

@@ -302,6 +302,12 @@ $`\;\Longrightarrow\left|\overrightarrow{U}\cdot\overrightarrow{V}=+||\overright
  \overrightarrow{U}\cdot\overrightarrow{V}=-||\overrightarrow{U}||\cdot||\overrightarrow{V}||
  \,si\, \widehat{\overrightarrow{U},\overrightarrow{V}}=\pi\right.`$ 
  
+ $`\overrightarrow{U}`$ et $`\overrightarrow{V}`$ sont colinéaires 
+$`\;\Longrightarrow\left|\overrightarrow{U}\cdot\overrightarrow{V}=+||\overrightarrow{U}||\cdot
+||\overrightarrow{V}|| \\ 
+ \overrightarrow{U}\cdot\overrightarrow{V}=-||\overrightarrow{U}||\cdot||\overrightarrow{V}||
+\right.`$ 
+
 $` \underline{\overrightarrow{B}}^{\,0}_{\,ref}=\left|\begin{array}{l} +\,B_{ref}^0\,cos\,\theta_{ref} \\ 0 
 \\ +\,B_{ref}^0\,sin\,\theta_{ref} \end{array}\right.\quad , \quad `$