Update cheatsheet.fr.md

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

@@ -104,7 +104,10 @@ $`\sin(\theta + \alpha)=\sin(\theta)\,\cos(\alpha)\,+\,\sin(\alpha)\,\cos(\theta
 
 donc
 
-$`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,\left[\cos(a)\cos(\alpha)\cos(\theta + \alpha)\,-\,\sin(a)\sin(\alpha)\sin(\theta + \alpha)
+$`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,\left[\cos(a)\cos(\alpha)\cos(\theta)\,\cos(\alpha)
+\,-\,\cos(a)\cos(\alpha)\sin(\theta)\,\sin(\alpha)
+\,-\,\sin(a)\sin(\alpha)\sin(\theta)\,\cos(\alpha)
+\,-\,\sin(a)\sin(\alpha)\sin(\alpha)\,\cos(\theta)
 \,+\,\sin(a)\,\cos^2(\alpha)\,\sin(\theta)
 \,+\,\sin(a)\,\cos(\alpha)\,\sin(\alpha)\,\cos(\theta)
 \,+\,\cos(a)\,\sin(\alpha)\,\cos(\alpha)\,\sin(\theta)
@@ -130,6 +133,8 @@ $`u_1\,v^1\,+\, u_2\,v^2\,= u\,v\,\dfrac{1}{\cos(a)} \,\left[\cos(a)\cos(\alpha)
 
 
 
+
+