Update cheatsheet.fr.md

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

@@ -1405,8 +1405,8 @@ $`\begin{align}\quad\;\,= \big[ (\omega_{moy}&+ \Delta \omega_{1-2})\, t + \big(
 &+( \varphi_{moy} + \Delta \varphi_{1-2})\big]\end{align}`$
 
 $`\begin{align}
-\quad\;\,&= \big[ \big(\underbrace{\omega_{moy} t + \overrightarrow{k}_{moy}\cdot\overrightarrow{r}+ \varphi_{moy}}_{\color{blue}{\theta_{moy}}}\big) \\
-&\quad + \big(\underbrace{\Delta \omega_{1-2} t + \Delta \overrightarrow{k}_{1-2}\cdot\overrightarrow{r}+\Delta\varphi_{1-2}}_{\color{blue}{\theta_{1-2}}}\big)\big]
+\quad\;\,&= \big[ \big(\underbrace{\omega_{moy} t + \overrightarrow{k}_{moy}\cdot\overrightarrow{r}+ \varphi_{moy}}_{\color{blue}{\theta_{moy}(\overrightarrow{r},t)}}\big) \\
+&\quad + \big(\underbrace{\Delta \omega_{1-2} t + \Delta \overrightarrow{k}_{1-2}\cdot\overrightarrow{r}+\Delta\varphi_{1-2}}_{\color{blue}{\theta_{1-2}(\overrightarrow{r},t)}}\big)\big]
 \end{align}`$
 
 **$`\quad\;\,=\,\theta_{moy}(\overrightarrow{r},t)\,+\,\theta_{1-2}(\overrightarrow{r},t)`$**