Update cheatsheet.fr.md

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

@@ -599,9 +599,9 @@ $`\quad\boldsymbol{\mathbf{=\color{brown}{2\,A\cdot cos\Big(\dfrac{\varphi_1-\va
   <br>
   $`\color{blue}{\scriptsize{\quad\text{Posons }kx - \omega t \,=\, \alpha}}`$   
   <br>
-  $`\quad =A\;\big[ \,e^{\,i\;(\alpha + \varphi_1)} + e^{\,i\;(\alpha + \varphi_2)}\,\big]`$
+  $`\quad =A\;\big[\,e^{\,i\;(\alpha + \varphi_1)} + e^{\,i\;(\alpha + \varphi_2)} \,\big]`$
   <br>
-  $`\color{blue}{\scriptsize{\quad\text{Rappel : } e^{\,i\;(a+b)\;=\;e^{\,i\,a}\times e^{\,i\,b}}}`$   
+  $`\color{blue}{\scriptsize{\quad\text{Rappel : } e^{\,i\;(a+b)}\;=\;e^{\,i\,a}\times e^{\,i\,b}}}`$   
   <br>
   $`\quad =A\;\big[ \,e^{\,i\,\alpha}\;e^{\,i\,\varphi_1}\; + \; e^{\,i\,\alpha}\;e^{\,i\,\varphi_2}\,\big]`$   
   $`\quad =A\;e^{\,i\,\alpha}\;\big[\,e^{\,i\,\varphi_1}\; + \; e^{\,i\,\varphi_2}\,\big]`$