Trig Identities Flashcards
1
Q
sin^2(x) + cos^2(x)
A
= 1
2
Q
sin(x)/cos(x)
A
= tan(x)
3
Q
1/sin(x)
A
= cosec(x)
4
Q
1/cos(x)
A
= sec(x)
5
Q
1/tan(x)
A
= cot(x)
6
Q
sin(A±B)
A
= sinAcosB ± sinBcosA
7
Q
cos(A+B)
A
cosAcosB - sinAsinB
8
Q
cos(A-B)
A
cosAcosB + sinAsinB
9
Q
sin(2x)
A
= 2sin(x)cos(x)
10
Q
cos(2x) (three)
A
cos^2(x) - sin^2(x)
1-2sin^2(x)
2cos^2(x)-1
11
Q
sinAsinB
A
=(1/2)(cos(A-B) - cos(A+B))
12
Q
cosAcosB
A
=(1/2)(cos(A-B) + cos(A+B))
13
Q
sinAcosB
A
=(1/2)(sin(A-B) - sin(A+B))
