Trig Identities Flashcards
1
Q
1/sin x
A
csc x
2
Q
1/cos x
A
sec x
3
Q
tan x = ?
A
sin x / cos x
4
Q
1/tan x
A
cot x
5
Q
cot x = ?
A
cos x / sin x
6
Q
1+ tan^2 x =?
A
sec^2 x
7
Q
1 + cot^2 x = ?
A
csc^2 x
8
Q
sin(π/2 - x) =
A
cos x
9
Q
cos(π/2 - x) =
A
sin x
10
Q
csc(π/2 - x) =
A
sec x
11
Q
sec(π/2 - x) =
A
csc x
12
Q
tan(π/2 - x) =
A
cot x
13
Q
cot(π/2 - x) =
A
tan x
14
Q
sin(-x) =
A
-sin x
15
Q
csc(-x) =
A
-csc x
16
Q
sec(-x) =
A
sec x
17
Q
cos(-x) =
A
cos x
18
Q
tan(-x) =
A
- tan x
19
Q
cot(-x) =
A
- cot x
20
Q
sin(a + b) =
A
sin a cos b + cos a sin b
21
Q
sin(a - b) =
A
sin a cos b - cos a sin b
22
Q
cos(a + b) =
A
cos a cos b - sin a sin b
23
Q
cos(a - b) =
A
cos a cos b + sin a sin b
24
Q
tan(a + b) =
A
tan a + tan b / 1 - tan a tan b
25
Q
sin 2a
A
2 sin a cos a
26
Q
cos 2a
A
cos^2 a − sin^2 a
2 cos^2 a − 1
1 − 2 sin^2 a
27
Q
tan 2a
A
2 tan a
1 − tan2 a
