Update cheatsheet.fr.md

12.temporary_ins/04-math-tools/70.systems-of-differential-equations/40.parallel-1/cheatsheet.fr.md

@@ -175,11 +175,11 @@ avec  $`I_n`$ matrice carré identité de dimensions $`n\times n`$
 
 * Si $`A`$ et $`B`$ commutent $`(AB = BA)`$, alors :   
 <br>
-**$`\large{\mathbf{e^{\,A+B} = e^{\,A}\,e^{\,B} = e^{\,B+A} = e^{\,B}\,e^{\,A}}} `$**
+*$`\large{\mathbf{e^{\,A+B} = e^{\,A}\,e^{\,B} = e^{\,B}\,e^{\,A}}}`$*
 
 * **$`\large{\mathbf{\big(e^{\,A}\big)^{-1} = e^{- A}}}`$** 
 
-* **$`\large{\mathbf{e^{\,A}\,A = A\,e^{\,A}}} `$** 
+* *$`\large{\mathbf{e^{\,A}\,A = A\,e^{\,A}}} `$* 
 
 * **$`\large{\mathbf{\dfrac{d}{dt}e^{\,A t} = A\,e^{\,A t}}}`$**