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10 cards from this deck
Expressions involving sum or difference of two angles
Does NOT apply: cos(α−β)≠cosα−cosβ\cos(\alpha - \beta) \neq \cos \alpha - \cos \betacos(α−β)=cosα−cosβ
cosαcosβ+sinαsinβ\cos \alpha \cos \beta + \sin \alpha \sin \betacosαcosβ+sinαsinβ
cosαcosβ−sinαsinβ\cos \alpha \cos \beta - \sin \alpha \sin \betacosαcosβ−sinαsinβ
sinαcosβ−cosαsinβ\sin \alpha \cos \beta - \cos \alpha \sin \betasinαcosβ−cosαsinβ
sinαcosβ+cosαsinβ\sin \alpha \cos \beta + \cos \alpha \sin \betasinαcosβ+cosαsinβ
Sign matches the angle operation (+ stays +, - stays -)
Sign opposite to angle operation (+ becomes -, - becomes +)
sinθ\sin \thetasinθ
45°+30°45° + 30°45°+30°
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