Trig Identities Flashcards
1
Q
sin(π / 6)
A
1/ 2
2
Q
sin(π / 4)
A
√2 / 2
3
Q
sin(π / 2)
A
1
4
Q
sin(π / 3)
A
√3 / 2
5
Q
cos(π / 6)
A
√3 / 2
6
Q
cos(π / 4)
A
√2 / 2
7
Q
tan(π / 6)
A
√3 / 3
7
Q
cos(π / 3)
A
1 / 2
8
Q
cos(π / 2)
A
0
9
Q
tan(π / 4)
A
1
10
Q
tan(π / 3)
A
√3
11
Q
tan(π / 2)
A
0
12
Q
csc x
A
1 / sin x
13
Q
sec x
A
1 / cos x
14
Q
cot x
A
1 / tan x
15
Q
tan x
A
sin x / cos x
16
Q
sin x^2 + cos x ^2
A
1
17
Q
sin^2 x
A
1 - cos^2 x
18
Q
cos^2 x
A
1 - sin^2 x
19
Q
sin(2x)
A
2 sin x cos x
20
Q
cos(2x)
A
cos^2 x - sin^2 x or 2 cos^2 x -1 or 1 - 2sin^2 x
21
Q
tan^2 + 1
A
sec^2 x
22
Q
cot^2 x + 1
A
csc^2 x
23
Q
sin(x / 2)
A
√1 - cos x / 2
24
Q
cos(x / 2)
A
√1 + cos x / 2
