1
Q
Tan =
A
Sin / Cos
2
Q
Cot =
A
Cos / Sin
or
1 / Tan
3
Q
Csc =
A
1 / Sin
4
Q
Sec =
A
1 / Cos
5
Q
Sin^2 θ =
A
1 - Cos^2 θ
6
Q
Cos^2 θ =
A
1 - Sin^2 θ
7
Q
Sec^2 θ =
A
1 + Tan^2 θ
8
Q
Tan^2 θ =
A
Sec^2 θ - 1
9
Q
Cot^2 θ =
A
Csc^2 θ - 1
10
Q
Csc^2 θ =
A
Cot^2 θ + 1
11
Q
Cos(a+b) =
A
Cosa * Cosb - Sina * Sinb
12
Q
Cos(a-b) =
A
Cosa * Cosb + Sina * Sinb
13
Q
Sin(a+b) =
A
Sina * Cosb + Sinb * Cosa
14
Q
Sin(a-b) =
A
Sina * Cosb - Sinb * Cosa
15
Q
Sin(2θ) =
A
2 Sinθ * Cosθ
16
Q
Cos(2θ) =
A
Cos^2 θ - Sin^2 θ
or
1 - Sin^2 θ
or 2Cos^2 θ - 1
AP Pre-Calc
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