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