Functia cos Flashcards
(10 cards)
1
Q
cos (a+b)
A
cosacosb-sinasinb
2
Q
cos (a-b)
A
cosacosb+sinasinb
3
Q
cos (pi/2-x)
A
sin x
4
Q
cos 2x
A
cos^2x-sin^2x
2cos^2x-1
1-2sin^2x
5
Q
cos3x
A
4cos^3x-3cosx
6
Q
cos^2x
A
1+cos2x/2
1/1+tg^2x
ctg^2x/1+ctg^2x
7
Q
cosacosb
A
cos(a+b)+cos(a-b)/2
8
Q
cosa+ cosb
A
2cos(a+b/2)•cos(a-b/2)
9
Q
cosa-cosb
A
-2sin(a+b/2)•sin(a-b/2)
10
Q
cos (-x)
A
cos x
