Update cheatsheet.fr.md

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

@@ -125,8 +125,7 @@ $`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,
 
 à vérifier et terminer
 
-$`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,
-\left[\cos(a)\cos^2(\alpha)\cos(\theta)
+$`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,\left[\cos(a)\cos^2(\alpha)\cos(\theta)
 \,-\,\cancel{\cos(a)\cos(\alpha)\sin(\theta)\,\sin(\alpha)}
 \,-\,\sin(a)\sin(\alpha)\sin(\theta)\,\cos(\alpha)
 \,-\,\sin(a)\sin^2(\alpha)\,\cos(\theta)
@@ -136,7 +135,16 @@ $`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,
 \,+\,\cos(a)\,\sin^2(\alpha)\,\cos(\theta)\right]`$
 
 
-
+$`\begin{multline}
+u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,\left[\cos(a)\cos^2(\alpha)\cos(\theta)\\
+\,-\,\cancel{\cos(a)\cos(\alpha)\sin(\theta)\,\sin(\alpha)}\\
+\,-\,\sin(a)\sin(\alpha)\sin(\theta)\,\cos(\alpha)\\
+\,-\,\sin(a)\sin^2(\alpha)\,\cos(\theta)\\
+\,+\,\xcancel{\sin(a)\,\cos^2(\alpha)\,\sin(\theta)}\\
+\,+\,\sin(a)\,\cos(\alpha)\,\sin(\alpha)\,\cos(\theta)\\
+\,+\,\cancel{\cos(a)\,\sin(\alpha)\,\cos(\alpha)\,\sin(\theta)}\\
+\,+\,\cos(a)\,\sin^2(\alpha)\,\cos(\theta)\right]\\
+\end{multline}`$