0
Q
cos(x-y) = ?
A
cosxcosy+sinxsiny
1
Q
cos(x+y) = ?
A
cosxcosy-sinxsiny
2
Q
sin(x+y) = ?
A
sinxcosy+sinycosx
3
Q
sin(x-y) = ?
A
sinxcosy-sinycosx
4
Q
tan(x+y) = ?
A
(tanx+tany) / 1-tanxtany
5
Q
tan(x-y) = ?
A
(tanx-tany) / (1+tanxtany)
6
Q
cos2θ=?
A
= 2cosθ^2-1
= 1-2sinθ^2
= cos^2θ-sinθ^2
7
Q
sin2θ = ?
A
2sinθcosθ
8
Q
tan2θ = ?
A
(2tanθ) / (1-tan^2θ)
9
Q
Co-Functions
A
sinθ = cosθ(π/2-θ) tanθ = cotθ(π/2-θ) secθ = cscθ(π/2-θ)
Psych 1XX3
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