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