Update cheatsheet.fr.md

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

@@ -344,9 +344,9 @@ $`\forall \alpha \in \mathbb{R}\;,\,`$ **$`\large{exp{\,\alpha} = cos \,\alpha +
    * soit en **notation complexe** :  
       1D : **$`\quad\large{\boldsymbol{\mathbf{\underline{U}(x,t)}}}`$** $`\;= A\cdot \underbrace{exp\,[\,i\,(\omega t - k x + \varphi}_{\color{blue}{exp(a+b) = exp(a)\times exp(b)})\,]}`$   
            <br>
-          $`\quad\quad\quad\quad\quad\quad =\underbrace{A\;e^{\,i\,\varphi}}_{\color{blue}{\underline{A}=A\; e^{\,i\,\varphi}}\cdot exp\,[\,i\,(\omega t - kx)\,]`$
+          $`\quad\quad\quad\quad\quad\quad =\underbrace{A\;e^{\,i\,\varphi}}_{\color{blue}{\underline{A}=A\; e^{\,i\,\varphi}}}\cdot exp\,[\,i\,(\omega t - kx)\,]`$
            <br>
-          **$`\quad\quad\quad\quad\quad\quad\boldsymbol{\mathbf{\large{=\underline{A}\cdot e^{\,i\,(\omega t - kx)}}}}`$**    
+          **$`\quad\quad\quad\quad\quad\quad\boldsymbol{\mathbf{\large{\,=\underline{A}\cdot e^{\,i\,(\omega t - kx)}}}}`$**    
      <br>
       3D : **$`\quad\large{\boldsymbol{\mathbf{\underline{U}(\vec{r},t)=\underline{A}\cdot e^{\,i\,(\omega t - \vec{k}\cdot\vec{r})}}}}`$**   
      <br>