Trig Identities Flashcards
1
Q
cos2A
0
A
cos^2 A- sin^2 A
2
Q
cos2A
2
A
2cos^2 A - 1
3
Q
cos2A
1
A
1- 2sin^2 A
4
Q
sin2A
A
2sinAcosA
5
Q
cotA
A
(cosA)/ (sinA)
6
Q
sin(A+-B)
A
sinAcosB+-cosAsinB
7
Q
cos(A+-B)
A
cosAcosB-+sinAsinB
8
Q
1 + tan^2 A
A
sec^2 A
9
Q
1 + cot^2 A
A
cosec^2 A
10
Q
sin^2 A + cos^2 A
A
1
11
Q
cos^2 A
A
1 - sin^2 A
12
Q
sin^2 A
A
1 - cos^2 A
13
Q
tanA
A
(sinA) / (cosA)
14
Q
cos^2 A
A
1/2 * (1 + cos2A)
15
Q
sin^2 A
A
1/2 * (1 - cos2A)
