Update...

Update 10.temporary-m3p2/50.mathematics/20.algebra-analysis/20.n2/20.trigonometry/20.overview/cheatsheet.fr.md

10.temporary-m3p2/50.mathematics/20.algebra-analysis/20.n2/20.trigonometry/20.overview/cheatsheet.fr.md

@@ -47,8 +47,24 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 
 RÉSUMÉ
 : ---   
-  
-  A faire
+  $`cos(a + b) = cos(a)\,cos(b) - sin(a)\,sin(b)`$
+
+  $`sin(a + b) = sin(a)\,cos(b) + cos(a)\,sin(b)`$
+
+  $`cos(a - b) = cos(a)\,cos(b) + sin(a)\,sin(b)`$
+
+  $`sin(a - b) = sin(a)\,cos(b) - cos(a)\,sin(b)`$
+
+  $`cos(a) + \cos(b) = 2 cos\left(\dfrac{a + b}{2}\right) cos\left(\dfrac{a - b}{2}\right)`$
+
+  $`sin(a) + \sin(b) = 2 sin\left(\dfrac{a + b}{2}\right) cos\left(\dfrac{a - b}{2}\right)`$
+
+  $`cos(a)\,cos(b) = \dfrac{1}{2} [cos(a + b) + cos(a - b)]`$
+
+  $`sin(a)\,sin(b) = \dfrac{1}{2} [cos(a - b) - cos(a + b)]`$
+
+  $`sin(a)\,cos(b) = \dfrac{1}{2} [sin(a + b) + sin(a - b)]`$
+
 
 <br><br>
 
@@ -146,24 +162,8 @@ $`cos(a - b) = cos(a)\,cos(b) + sin(a)\,sin(b)`$
 $`sin(a - b) = sin(a)\,cos(b) - cos(a)\,sin(b)`$
 
 
-##### à mettre dans le résumé de départ
-
-$`cos(a + b) = cos(a)\,cos(b) - sin(a)\,sin(b)`$
-
-$`sin(a + b) = sin(a)\,cos(b) + cos(a)\,sin(b)`$
-
-$`cos(a - b) = cos(a)\,cos(b) + sin(a)\,sin(b)`$
-
-$`sin(a - b) = sin(a)\,cos(b) - cos(a)\,sin(b)`$
-
-$`cos(a) + \cos(b) = 2 cos\left(\dfrac{a + b}{2}\right) cos\left(\dfrac{a - b}{2}\right)`$
-
-$`sin(a) + \sin(b) = 2 sin\left(\dfrac{a + b}{2}\right) cos\left(\dfrac{a - b}{2}\right)`$
 
-$`cos(a)\,cos(b) = \dfrac{1}{2} [cos(a + b) + cos(a - b)]`$
 
-$`sin(a)\,sin(b) = \dfrac{1}{2} [cos(a - b) - cos(a + b)]`$
 
-$`sin(a)\,cos(b) = \dfrac{1}{2} [sin(a + b) + sin(a - b)]`$