diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
index bb49ca4c0..ab91291f7 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
@@ -667,7 +667,9 @@ Por INSA / pour l'INSA / for INSA :
 
 $`\displaystyle\dfrac{d\left(\overrightarrow{OM}\right)(t)}{dt}
 =\lim_{\Delta t\rightarrow 0}
-\left(\dfrac{\overrightarrow{OM}\right)(t+\Delta t)-\overrightarrow{OM}\right)(t))}{\Delta t}\right)`$
+\left(
+\dfrac{\overrightarrow{OM}(t+\Delta t)-\overrightarrow{OM}(t))}{\Delta t}
+\right)`$