Update cheatsheet.fr.md

12.temporary_ins/08.conservative-vector-fields/20.conservative-vector-fields-properties/20.overview/cheatsheet.fr.md

@@ -449,11 +449,12 @@ $`\color{brown}{\mathbf{
 ##### Expression du gradient en coordonnées cartésiennes
 
 $`\left.\begin{align}
-dl_x=dx \Longrightarrow $`\dfrac{\partial x}{\partial dl_{x}}=1\\
-dl_y=dy \Longrightarrow $`\dfrac{\partial y}{\partial dl_{y}}=1\\
-dl_z=dz \Longrightarrow $`\dfrac{\partial z}{\partial dl_{z}}=1\\
+dl_x=dx \Longrightarrow \dfrac{\partial x}{\partial dl_x}=1\\
+dl_y=dy \Longrightarrow \dfrac{\partial y}{\partial dl_y}=1\\
+dl_z=dz \Longrightarrow \dfrac{\partial z}{\partial dl_z}=1\\
 \end{align}\right\}`$
-$`\Longrightarrow\color{brown}{\mathbf{\overrightarrow{grad}\,\phi=
+$`\Longrightarrow\color{brown}{\mathbf{
+\overrightarrow{grad}\,\phi=
 \dfrac{\partial \phi}{\partial x}\,\overrightarrow{e_x}
 +\dfrac{\partial \phi}{\partial y}\,\overrightarrow{e_y}
 +\dfrac{\partial \phi}{\partial z}\,\overrightarrow{e_z}