Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

@@ -215,10 +215,8 @@ puis d'une onde plane progressive monochromatique (OPPM).
   $`\left.
     \begin{align} 
     &\underbrace{\overrightarrow{rot}\,\overrightarrow{B}=
-    \mu_0\,\overrightarrow{j}+\underbrace{\mu_0\epsilon_0}_{\color{blue}{=\dfrac{1}{c^2}}\,
-     \dfrac{\partial \overrightarrow{E}}{\partial t}_{\color{blue}{\text{th. de Maxwell-Faraday}
-     =\dfrac{1}{c^2}\,\dfrac{\partial \overrightarrow{E}}{\partial t}}
-    }}\\
+    \mu_0\,\overrightarrow{j}+\mu_0\epsilon_0\,\dfrac{\partial \overrightarrow{E}}{\partial t}_{\color{blue}{\text{th. de Maxwell-Faraday}}
+     =\dfrac{1}{c^2}\,\dfrac{\partial \overrightarrow{E}}{\partial t}}}\\
     \\
     &\overrightarrow{B}\;uniforme\\
     &dans\;tout\;plan\;\perp\overrightarrow{e_z}\end{align}\right\}`$