Update cheatsheet.fr.md

12.temporary_ins/20.magnetostatics-vacuum/40.ampere-theorem-applications/30.cylindrical-current-distributions/10.rectilinear-current/20.ampere-local/20.overview/cheatsheet.fr.md

@@ -288,15 +288,15 @@ $`\mathbf{\forall M \in \mathscr{E}\; , \; B_{\rho}=B_z=0}`$
  \right.`$**
  
 * $`\Longrightarrow`$ l'expression du *rotarionnel de $`\overrightarrow{B}`$ se simplifie* en tout point de l'espace :   
-**$`\mathbf{\overrightarrow{rot}\,\overrightarrow{B}}`$**
+<br>
 $`\require{\cancel}\begin{align}
 \color{brown}{\mathbf{\overrightarrow{rot}\,\overrightarrow{B}}}
-&\;=\left(\dfrac{1}{\rho}\,\dfrac{\partial B_z}{\partial\varphi}\;-\;\dfrac{\partial B_{\varphi}}{\partial z}\right)\,\overrightarrow{e_{\rho}}\\
+&\;=\left(\xcancel{\dfrac{1}{\rho}\,\dfrac{\partial B_z}{\partial\varphi}}\;-\;\xcancel{\dfrac{\partial B_{\varphi}}{\partial z}}\right)\,\overrightarrow{e_{\rho}}\\
 \\
-&\quad\; +\left(\dfrac{\partial B_{\rho}}{\partial z}\;-\;\dfrac{\partial B_z}{\partial \rho}\right)\,\overrightarrow{e_{\varphi}}\\
+&\quad\; +\left(\xcancel{\dfrac{\partial B_{\rho}}{\partial z}}\;-\;\xcancel{\dfrac{\partial B_z}{\partial \rho}}\right)\,\overrightarrow{e_{\varphi}}\\
 \\
 &\quad\; +
-\,\dfrac{1}{\rho}\,\left(\dfrac{\partial (\,\rho\,B_{\varphi})}{\partial \rho}\;-\;\dfrac{\partial B_{\rho}}{\partial \varphi}\right)
+\,\dfrac{1}{\rho}\,\left(\dfrac{\partial (\,\rho\,B_{\varphi})}{\partial \rho}\;-\;\xcancel{\dfrac{\partial B_{\rho}}{\partial \varphi}}\right)
 \,\overrightarrow{e_z}
 \end{align}`$**