Update cheatsheet.fr.md

12.temporary_ins/08.grad-div-rot/20.div/20.overview/cheatsheet.fr.md

@@ -45,9 +45,17 @@ div\,\overrightarrow{X}\color{gray}{\;=\dfrac{d\Phi_X}{d\tau}}\,=\; &\dfrac{1}{r
 
 ### L'opérateur rotationnel
 
+$`\overrightarrow{rot}\;\overrightarrow{X_M} \cdot \overrightarrow{e_x}=
+\left.\dfrac{\partial Z}{\partial y}\right|_M -\left.\dfrac{\partial Y}{\partial z}\right|_M`$
+
+$`\overrightarrow{rot}\;\overrightarrow{X_M} \cdot \overrightarrow{e_y}=
+\left.\dfrac{\partial X}{\partial z}\right|_M -\left.\dfrac{\partial Z}{\partial x}\right|_M`$
 
 ##### Expression du rotationnel en coordonnées cartésiennes
 
+<br>**$`\boldsymbol{\mathbf{\overrightarrow{rot}\,\overrightarrow{X}\,= `$
+
+
 <br>**$`\boldsymbol{\mathbf{div\,\overrightarrow{X}\,=\,\color{gray}{\dfrac{d\Phi_X}{d\tau}}\,=\,\dfrac{\partial X_x}{\partial x}+\dfrac{\partial X_y}{\partial y}+\dfrac{\partial X_z}{\partial z}
 }}`$**