Update cheatsheet.fr.md

12.temporary_ins/08.grad-div-rot/70.combinaisons-of-operators/20.overview/cheatsheet.fr.md

@@ -34,8 +34,8 @@ $`\color{blue}{\overrightarrow{rot}\,\overrightarrow{E}=
 \end{array}\right)}`$
 
 
-\overrightarrow{rot}\big(-\ overrightarrow{rot}\,\overrightarrow{E}=
-\begin{array}{l}\left[
+$`\overrightarrow{rot}\big(\ overrightarrow{rot}\,\overrightarrow{E}=
+\left[\begin{array}{l}
 dfrac{\partial}{\partial y}\left(
 \color{blue}{\dfrac{\partial E_y}{\partial x}-\dfrac{\partial E_x}{\partial y}}
 \right)