Trig Identities Flashcards
1
Q
sin^2x + cos^2x
A
1
2
Q
tan^2x + 1
A
sec^2x
3
Q
1 + cot^2x
A
csc^2x
4
Q
sin(-x)
A
-sinx
5
Q
cos(-x)
A
cosx
6
Q
tan(-x)
A
-tanx
7
Q
cos(π/2 - x)
A
sinx
8
Q
sin(π/2 - x)
A
cosx
9
Q
tan(π/2 - x)
A
cotx
10
Q
cot(π/2 - x)
A
tanx
11
Q
csc(π/2 - x)
A
secx
12
Q
sec(π/2 - x)
A
cscx
13
Q
sin(x +/- 2π)
A
sinx
14
Q
cos(x +/- 2π)
A
cosx
15
Q
tan(x +/- 2π)
A
tanx
16
Q
cot(x +/- 2π)
A
cotx
17
Q
sec(x +/- 2π)
A
secx
18
Q
csc(x +/- 2π)
A
cscx
19
Q
2(sinxcosx)
A
2sinx
20
Q
cos2x
A
cos^2x - sin^2x
1- 2sin^2x
2cos^2x-1
21
Q
tan2x
A
(2tanx) / (1-tan^2x)
