Trig Identities Flashcards
1
Q
1+ cot²(x)
A
cosec²(x)
2
Q
1+tan²(x)
A
sec²(x)
3
Q
cos(A+B)
A
cosAcosB - sinAsinB
4
Q
cos(A-B)
A
cosAcosB + sinAsinB
5
Q
sin(A+B)
A
sinAcosB + cosAsinB
6
Q
sin(A-B)
A
sinAcosB - cosAsinB
7
Q
Three equations that cos2A can turn into
A
- 2cos²A -1
- cos²A - sin²A
- 1-2Sin²A
8
Q
sin2A
A
2SinACosA
9
Q
tan(A-B)
A
tanA-tanB/ 1+tanAtanB
10
Q
tan(A+B)
A
tanA + tanB / 1-tanAtanB
11
Q
tan2A
A
2 tanA / 1-tan²(A)
