Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

@@ -110,12 +110,13 @@ Attention !!! En période très préliminaire d'élaboration et de construction
   $`\Longrightarrow \iiint_{\tau} div \overrightarrow{E}\,d\tau = \iiint_{\tau}\dfrac{\dens}{\epsilon_0}\,d\tau`$
 
 $`\left.\begin{array}{l}
-\Longrightarrow \iiint_{\tau} div \overrightarrow{E}\,d\tau = \iiint_{\tau}\dfrac{\dens}{\epsilon_0}\,d\tau \\
-\displaystyle\iiint_{\tau} div\;\overrightarrow{X} \cdot d\tau = \displaystyle 
-\oiint_{S\leftrightarrow\tau} \overrightarrow{X}\cdot\overrightarrow{dS}
+\iiint_{\tau} div \overrightarrow{E}\,d\tau = \iiint_{\tau}\dfrac{\dens}{\epsilon_0}\,d\tau \\
+\iiint_{\tau} div\;\overrightarrow{E} \cdot d\tau = \displaystyle 
+\oiint_{S\leftrightarrow\tau} \overrightarrow{E}\cdot\overrightarrow{dS}
 \end{array}\right\}
 \Longrightarrow`$
-**$`\mathbf{\cdot\cdot\cdot}`$**
+**$`\mathbf{\displaystyle \oiint_{S\leftrightarrow\tau} \overrightarrow{E}\cdot\overrightarrow{dS}
+= \dfrac{1}{\epsilon_0} \cdot \iiint_{\tau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0} `$}`$**
 
   $`\Longrightarrow \iiint_{\tau} div \overrightarrow{E}\,d\tau = \iiint_{\tau}\dfrac{\dens}{\epsilon_0}\,d\tau`$
 $`\displaystyle\iint_S \overrightarrow{rot} \,\overrightarrow{E}\cdot \overrightarrow{dS}