Trigonometric Identities Flashcards
1
Q
sin(2x)
A
2sin(x)cos(x)
2
Q
cos(2x)
A
cos^2(x) - sin^2(x)
cos^2(x) - 1
1 - sin^2(x)
3
Q
tan(2x)
A
2tan(x) / 1 - tan^2(x)
4
Q
sin(3x)
A
3sin(x) - 4sin^3(x)
5
Q
cos(3x)
A
4cos^3(x) - 3cos(x)
6
Q
sin(4x)
A
8sin(x)cos(x) - 4sin(x)cos(x)
7
Q
cos(4x)
A
4cos^2(x) + 1
8
Q
sin(x + y)
A
sin(x)cos(y) + cos(x)sin(y)
9
Q
cos(x + y)
A
cos(x)cos(y) - sin(x)sin(y)
10
Q
tan(x + y)
A
tan(x) + tan(y) / 1 - tan(x)tan(y)
11
Q
A
