trigonometria Flashcards
1
Q
cos 3a
A
4cos^3 a - 3 cos a
2
Q
sen 3a
A
3 sen a - 4 sen^3 a
3
Q
sen 2a
A
2 sen a cos a
4
Q
cos 2a
A
• cos^2 a - sen^2 a
• 2 cos^2 a - 1
• 1 - 2 sen^2 a
5
Q
tg 2a
A
2 tg a / (1- tg^2 a)
6
Q
sen a + sen b
A
2 sen (a+b/2) cos (a-b/2)
7
Q
sen a - sen b
A
2 sen (a-b/2) cos (a+b/2)
8
Q
cos a + cos b
A
2 cos (a+b/2) cos (a-b/2)
9
Q
cos a - cos b
A
-2 sen (a+b/2) sen (a-b/2)
10
Q
tg a + tg b
A
sen (a+b) / (cos a cos b)
11
Q
tg a - tg b
A
sen (a-b)/(cos a cos b)
12
Q
1/4 sen 3x
A
sen x • sen (60-x) • sen (60+x)
13
Q
1/4 cos 3x
A
cos x • cos (60-x) • cos (60 + x)
14
Q
tg 3x
A
tg x • tg (60-x) • tg (60+x)
15
Q
2 cos a cos b
A
cos (a-b) + cos (a+b)
