Update cheatsheet.fr.md

12.temporary_ins/69.waves/30.n3/20.overview/cheatsheet.fr.md

@@ -1042,14 +1042,16 @@ _ figure erronée à refaire_
   **$`\large{\boldsymbol{\mathbf{\Lambda = \dfrac{\lambda_1}{sin\,\theta_1}}}}\quad`$** 
   et *$`\quad\large{\boldsymbol{\mathbf{\Lambda = \dfrac{\lambda_2}{sin\,\theta_2}}}}`$*.   
   <br>
-  $`\begin{align}
-   \left.\begin{align}
+  $`\left.\begin{align}
    &\Lambda = \dfrac{\lambda_1}{sin\,\theta_1}\\
    &\Lambda = \dfrac{\lambda_2}{sin\,\theta_2}
-   \end{align}\right\}&\Longrightarrow\;\dfrac{sin\,\theta_1}{\lambda_1}=\dfrac{sin\,\theta_2}{\lamnda_2}\\
-   &\Longrightarrow\;\dfrac{sin\,\theta_1}{\mathscr{v}_1\,T}=\dfrac{sin\,\theta_2}{\mathscr{v}_2\,T}\\
-   &\Longrightarrow\;\dfrac{sin\,\theta_1}{\mathscr{v}_1}=\dfrac{sin\,\theta_2}{\mathscr{v}_2}
+   \end{align}\right\}&\Longrightarrow\;\dfrac{sin\,\theta_1}{\lambda_1}=\dfrac{sin\,\theta_2}{\lamnda_2}
    \end{align}`$   
+   <br>
+   $`\Longrightarrow\;\dfrac{sin\,\theta_1}{\mathscr{v}_1\,T}=\dfrac{sin\,\theta_2}{\mathscr{v}_2\,T}`$   
+   <br>
+   $`\Longrightarrow\;\color{brown}{\large{\boldsymbol{\mathbf{\dfrac{sin\,\theta_1}{\mathscr{v}_1}=\dfrac{sin\,\theta_2}{\mathscr{v}_2}}}}}`$
+