Trigonometric Identities Flashcards
1
Q
Circle
A
x^2+y^2=r^2
2
Q
Sin X
A
y/r
3
Q
Tan X
A
y/x = sin x/cos x
4
Q
Cos^2 X + Sin^2 X
A
1
5
Q
1+Tan^2 X
A
Sec^2 X
6
Q
1+Cot^2 X
A
Csc^2 X
7
Q
Csc X
A
1/csc x
8
Q
Sec X
A
1/cos x
9
Q
Cot X
A
1/tan x
10
Q
Sin X
A
1/csc x
11
Q
Cos X
A
1/sec x
12
Q
Tan X
A
1/cot x
13
Q
Sin(-X)
A
-Sin X
14
Q
Csc(-X)
A
-Csc X
15
Q
Tan(-X)
A
-Tan X
16
Q
Cot(-X)
A
-Cot X
17
Q
Cos(-X)
A
Cos X
18
Q
Sec(-X)
A
Sec X
19
Q
Sin(A+B)
A
sinAcosB+ cosAsinB
20
Q
Cos(A+B)
A
cosAcosB- sinAsinB
21
Q
Tan(A+B)
A
tanA+tanB/1-tanAtanB
22
Q
Sin(A-B)
A
sinAcosB-cosAsinB
23
Q
Cos(A-B)
A
cosAcosB+sinAsinB
24
Q
Tan(A-B)
A
tanA-tanB/1+tanAtanB
25
Q
sin2X
A
2sinXcosX
26
Q
cos2X
A
cos^2X-sin^2X or 2cos^2X-1 or 1-2sin^2X
27
Q
tan2X
A
2tanX/1-tan^2X
28
Q
sin^2X
A
1-cos2X/2
29
Q
cos^2X
A
1+cos2X/2
