Update cheatsheet.fr.md

12.temporary_ins/07.geometry-coordinates-prop2/40.n4/20.overview/cheatsheet.fr.md

@@ -1011,11 +1011,12 @@ $`\begin{align}\Large{\dfrac{d\mathbf{v}}{d\lambda}}&=\dfrac{d}{d\lambda}\,\bigg
 \\
 =\dfrac{dv^a}{d\lambda}\,\mathbf{e_a}+v^a\,\dfrac{d\mathbf{e_a}}{d\lambda}\\
 \\
-=\dfrac{dv^a}{d\lambda}\,\mathbf{e_a}+v^a\,\underbrace{\dfrac{d\mathbf{e_a}}{dx^b}}{\color{brown}{=\,\Gamma_{ab}{\;c}}}
+=\dfrac{dv^a}{d\lambda}\,\mathbf{e_a}+v^a\,\underbrace{\dfrac{d\mathbf{e_a}}{dx^b}}_{\color{brown}{=\,\Gamma_{ab}{\;c}\,\mathbf{e_c}}}
 \,\dfrac{d\mathbf{x^b}}{d\lambda}\\
 \\
-=\dfrac{dv^a}{d\lambda}\,\mathbf{e_a}+v^a\,\underbrace{\dfrac{d\mathbf{e_a}}{dx^b}}{\color{brown}{=\,\Gamma_{ab}{\;c}}}
-\,\dfrac{d\mathbf{x^b}}{d\lambda}\\
+=\dfrac{dv^a}{d\lambda}\,\mathbf{e_a}+v^a\,\dfrac{d\mathbf{x^b}}{d\lambda}\,\Gamma_{ab}{\;c}\,\mathbf{e_c}\\
+\Gamma_{ab}{\;c}{\color{brown}{=\,\Gamma_{ab}{\;c}}}
+\,\dfrac{d\mathbf{x^b}}{d\lambda}
 \end{align}`$