Update cheatsheet.fr.md

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

@@ -53,35 +53,10 @@ $`\overrightarrow{rot}\;\overrightarrow{X_M} \cdot \overrightarrow{e_y}=
 
 ##### Expression du rotationnel en coordonnées cartésiennes
 
-<br>**$`\boldsymbol{\mathbf{\overrightarrow{rot}\,\overrightarrow{X}\,= `$
-
-
-<br>**$`\boldsymbol{\mathbf{div\,\overrightarrow{X}\,=\,\color{gray}{\dfrac{d\Phi_X}{d\tau}}\,=\,\dfrac{\partial X_x}{\partial x}+\dfrac{\partial X_y}{\partial y}+\dfrac{\partial X_z}{\partial z}
-}}`$**
 
 ##### Expression du rotationnel en coordonnées cylindriques
 
-<br>**$`\boldsymbol{\mathbf{div\,\overrightarrow{X}\,\color{gray}{=\,\dfrac{d\Phi_X}{d\tau}}\,=\,\dfrac{1}{\rho}\;\dfrac{\partial\,(\,\rho\,X_{\rho})}{\partial\,\rho}
-+\dfrac{1}{\rho}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}+\dfrac{\partial\,X_{z}}{\partial\,z}}}`$**
-
-<!--
-<br>**$`div\,\overrightarrow{X}\;\color{gray}{=\;\dfrac{d\Phi_X}{d\tau}}\;=\;\dfrac{1}{\rho}\;\dfrac{\partial\,(\,\rho\,X_{\rho})}{\partial\,\rho}
-+\dfrac{1}{\rho}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}+\dfrac{\partial\,X_{z}}{\partial\,z}`$**
--->
 
 ##### Expression du rotationnel en coordonnées sphériques
 
-<br>**$`\boldsymbol{d\mathbf{iv\,\overrightarrow{X}\color{gray}{\;=\dfrac{d\Phi_X}{d\tau}}\,=
-\; \dfrac{1}{r^2}\;\dfrac{\partial\,(r^2\,X_r}{\partial\,r)}}}`$**   
-   
-**$`\hspace{4.5cm}\boldsymbol{\mathbf{+ \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,(sin\,\theta\,X_{\theta})}{\partial\,\theta}}}`$**   
-   
-**$`\hspace{6.2cm}\boldsymbol{\mathbf{+ \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}}}`$**
-
-<!--
-<br>**$`\mathbf{\boldsymbol{\begin{align}
-div\,\overrightarrow{X}\color{gray}{\;=\dfrac{d\Phi_X}{d\tau}}\,=\; &\dfrac{1}{r^2}\;\dfrac{\partial\,(r^2\,X_r}{\partial\,r)}\\
-& \quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,(sin\,\theta\,X_{\theta})}{\partial\,\theta}\\
-& \quad\quad\quad\quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}\end{align}}}`$**
--->