cos(x + y)

π
+ x = − sin(x)
2
π
+ x = cos(x)
sin
2
cos
π
+x
2
π
−x
2
π
− x = sin(x)
2
π
− x = cos(x)
sin
2
cos
cos(π − x) = − cos(x)
sin(π − x) = sin(x)
cos(π + x) = − cos(x)
sin(π + x) = − sin(x)
x
0
cos(x) 1
sin(x) 0
√π/6
3/2
1/2
√π/4
√2/2
2/2
π−x
x
π+x
−x
π/3
√1/2
3/2
π/2
0
1
cos(x + y) = cos x cos y − sin x sin y
sin(x + y) = sin x cos y + cos x sin y
2
cos(x) + sin(x)2 = 1.
Document disponible sur http://math.univ-bpclermont.fr/~royer/ens/L1S1/
cos(−x) = cos(x)
sin(−x) = − sin(x)