Trig and Math Flashcards
1
Q
cosθ = sin(a) What is a?
A
a = π/2 - θ or a= θ + π/2 so cosθ = sin(π/2 - θ) = sin(θ + π/2)
2
Q
If sinθ=cosa, what is a?
A
a=π/2 - θ or a= θ - π/2 so sinθ = cos(π/2 - θ) = cos(θ - π/2)
3
Q
cos(θ + π/2)
A
-sinθ
4
Q
sin(θ - π/2)
A
-cosθ
5
Q
sin(π/6)
A
1/2
6
Q
sin(π/4)
A
1/√2
7
Q
sin(π/3)
A
√3 / 2
8
Q
cos(π/3)
A
1/2
9
Q
cos(π/4)
A
1/√2
10
Q
cos(π/6)
A
√3 / 2
11
Q
Law of cosines
A
b2 = a2 + c2 - 2ac cosβ
12
Q
A
