ident. trig. Flashcards
1
Q
sen² x + cos² x =
A
1
2
Q
cotg² x + 1 =
A
cossec ² x
3
Q
tg ² x + 1 =
A
sec² x
4
Q
sen(π/2 + x) =
A
cos x
5
Q
sen -x =
A
- sen x
6
Q
cos -x
A
cos x
7
Q
tg -x =
A
- tg x
8
Q
cossec -x =
A
- cossec x
9
Q
sec -x =
A
sec x
10
Q
cotg -x =
A
- tg x
11
Q
sen(a+b) =
A
sen a . cos x + sen b . cos a
12
Q
sen(a - b) =
A
sen a . cos b - sen b . cos a
12
Q
cos(a + b) =
A
cos a . cos b - sen a. sen b
13
Q
cos(a - b)=
A
cos a . cos b - sen a . sen b
14
Q
tg(a + b) =
A
tg a + tg b ÷ 1- tg a. tg b
15
Q
tg(a - b) =
A
tg a - tg b ÷ 1+tg a. tg b
16
Q
sen(π/2 + x) =
A
cos x
17
Q
cos(π/2 - x) =
A
sen x
18
Q
tan (π/2 + x) =
A
cotg x
19
Q
csc(π/2 - x) =
A
sec x
20
Q
sec(π/2 - x) =
A
csc x
21
Q
cotg(π/2 - x) =
A
tan x
22
Q
sen 2x =
A
- senx . cos x
23
Q
cos 2x =
A
cos² x - sen² x
Ou
2 . cos²x -1
Ou
1 - 2 . sen² x
24
tan 2x =
2 . tan x ÷ 1 - tan² x
25
sen² x =
(1 - cos 2x) ÷ 2
26
cos² x =
(1 + cos 2x) ÷ 2
27
tan ² x =
(1- cos 2x) ÷ (1 + cos 2x
28
tan x/2 =
±√(1 - cos x ÷ 1 + cos x)
Ou
(1- cos x) ÷ sen x
Ou
sen x ÷ (1 + cos x)
29
sen x/2 =
±√(1 - cos x ÷ 2)
30
cos x/2 =
±√(1 + cos x ÷ 2)
