Trig ID Flashcards
1
Q
Double Angle: sin(2x) =
A
2sin(x)cos(x)
2
Q
Double Angle: cos(2x) =
A
cos^2(x)-sin^2(x)
3
Q
Double Angle: tan(2x) =
A
2tan(x)/1-tan^2(x)
4
Q
sec^2(x) =
A
1 + tan^2(x)
5
Q
csc^2(x)
A
1 + cot^2(x)
6
Q
cos^2(x) + sin^2(x) =
A
1
7
Q
sin(u + v) =
A
sin(u)cos(v) + cos(u)sin(v)
8
Q
cos(u + v) =
A
cos(u)cos(v) - sin(u)sin(v)
9
Q
tan(u + v) =
A
(tan(u) + tan(v))/(1 - tan(u)tan(v))
10
Q
sin(x/2) =
A
±sqrt((1-cos(x))/2)
11
Q
cos(x/2) =
A
±sqrt((1 + cos(x))/2)
12
Q
tan(x/2) =
A
(1 - cos(x))/sin(x)
13
Q
Power Reduction: sin^2(x) =
A
(1 - cos(2x))/2
14
Q
Power Reduction: cos^2(x) =
A
(1 + cos(2x))/2
15
Q
Power Reduction: tan^2(x) =
A
(1 - cos(2x))/(1 + cos(2x))
