Update cheatsheet.fr.md

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

@@ -42,7 +42,7 @@ div\,\overrightarrow{X}\color{black}{\;=\dfrac{d\Phi_X}{d\tau}}\,= &\dfrac{1}{r^
 
 <br>
 
-**$`\begin{align}
-\boldsymbol{\mathbf{div\,\overrightarrow{X}\color{black}{\;=\dfrac{d\Phi_X}{d\tau}}\,= &\dfrac{1}{r^2}\;\dfrac{\partial\,(r^2\,X_r}{\partial\,r}}}\\
-\boldsymbol{\mathbf{& \quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,(sin\,\theta\,X_{\theta})}{\partial\,\theta}}}\\
-\boldsymbol{\mathbf{& \quad\quad\quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}}}\end{align}`$**
+**$`\mathbf{\boldsymbol{\begin{align}
+div\,\overrightarrow{X}\,= &\dfrac{1}{r^2}\;\dfrac{\partial\,(r^2\,X_r}{\partial\,r}\\
+& \quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,(sin\,\theta\,X_{\theta})}{\partial\,\theta}\\
+& \quad\quad\quad\quad + \dfrac{1}{r\,sin\,\theta}\;\dfrac{\partial\,X_{\varphi}}{\partial\,\varphi}\end{align}}}`$**