1
Q
cosacosb
A
1/2 (cos(a − b) + cos(a + b))
2
Q
sinasinb
A
1/2 (cos(a − b) − cos(a + b))
3
Q
sinacosb
A
1/2 (sin(a + b) + sin(a − b))
4
Q
cosp+cosq
A
2cos p+q/2 cos p−q/2
5
Q
cosp−cosq
A
−2sin p+q/2 sin p−q/2
6
Q
sinp+sinq
A
2sin p+q/2 cos p−q/2
7
Q
sinp−sinq
A
2cos p+q/2 sin p−q/2
8
Q
cos^2 x
A
LINÉARISATION : (1 + cos 2x )/2
9
Q
sin^2x
A
LINÉARISATION : (1 - cos 2x )/2
10
Q
tan(a+b)
A
tana+tanb
1 − tanatanb
11
Q
cos(a + b)
A
cosacosb − sinasinb
12
Q
sin(a + b)
A
sinacosb + cosasinb
13
Q
1 + tan^2 x
A
1 /cos^2 x
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