Update cheatsheet.fr.md

12.temporary_ins/32.sets-systems/30.n3/20.systems/20.overview/cheatsheet.fr.md

@@ -79,8 +79,8 @@ RÉSUMÉ<br>
   $`\displaystyle\begin{align}
    \;\;&\Longrightarrow\quad\left.\dfrac{dN}{N}\right\lvert_{\,\bigt}=r\,dt\\
    \\
-   &\Longrightarrow\;\underbrace{\int_{N(t_1)}^{N(t_2)}\dfrac{dN}{N}}_{\begin{array}{c}
-   \text{Primitive }\left(\large{\frac{dx}{x}} \right)\\ =\;ln\,|\,x\,|\end{array}}=\int_{t_1}^{t_2} r\,dt\\
+   &\Longrightarrow\;\underbrace{\int_{N(t_1)}^{N(t_2)}\dfrac{dN}{N}}_{\color{blue}{\begin{array}{c}
+   \text{Primitive }\left(\large{\frac{dx}{x}} \right)\\ =\;ln\,|\,x\,|\end{array}}}=\int_{t_1}^{t_2} r\,dt\\
    \\
    &\Longrightarrow\;\big[\,ln\,|N|\,\big]_{N(t_1)}^{N(t_2)}= r \,\big[\,t\,\big]_{t_1}^{t_2}\\
    \\