Trigonometry Flashcards
1
Q
sin2x
A
2sinx•cosx
2
Q
cos2x
A
cos2x - sin2x
1 - 2sin2x
2cos2x - 1
3
Q
cos2x
A
(1/2)•(1 + cos2x)
4
Q
sin2x
A
(1/2)•(1 - cos2x)
5
Q
sin2x + cos2x
A
1
6
Q
1 + tan2x
A
sec2x
7
Q
1 + cot2x
A
csc2x
8
Q
sin0
A
0
9
Q
cos0
A
1
10
Q
tan0
A
0
11
Q
sin(π/6)
A
1/2
12
Q
cos(π/6)
A
√(3)/2
13
Q
tan(π/6)
A
1/√(3)
14
Q
sin(π/4)
A
√(2)/2
1/√(2)
15
Q
cos(π/4)
A
√(2)/2
1/√(2)
16
Q
tan(π/4)
A
1
17
Q
sin(π/3)
A
√(3)/2
18
Q
cos(π/3)
A
1/2
19
Q
tan(π/3)
A
√(3)
20
Q
sin(π/2)
A
1
21
Q
cos(π/2)
A
0
22
Q
tan(π/2)
A
∞
23
Q
sin(π)
A
0
24
Q
cos(π)
A
-1
25
Q
tan(π)
A
0
26
Q
sin(3π/2)
A
-1
27
Q
cos(3π/2)
A
0
28
Q
tan(3π/2)
A
∞
29
Q
sin(2π)
A
0
30
Q
cos(2π)
A
1
31
Q
tan(2π)
A
0
32
Q
sin(u + v)
sin(u – v)
A
sinu•cosv + cosu•sinv
sinu•cosv – cosu•sinv
33
Q
cos(u + v)
cos(u – v)
A
cosu•cosv – sinu•sinv
cosu•cosv + sinu•sinv
34
Q
tan(u + v)
tan (u – v)
A
(tanu + tanv)/(1 – tanu•tanv)
(tanu – tanv)/(1 + tanu•tanv)
