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10 questions from this quiz
Distributive law doesn't apply to trig
cosαcosβ+sinαsinβ\cos α \cos β + \sin α \sin βcosαcosβ+sinαsinβ
sinαcosβ+cosαsinβ\sin α \cos β + \cos α \sin βsinαcosβ+cosαsinβ
Sign matches the angle operation
cosαcosβ−sinαsinβ\cos α \cos β - \sin α \sin βcosαcosβ−sinαsinβ
45°+30°45° + 30°45°+30°
sin65°\sin 65°sin65°
−sinβ-\sin β−sinβ
cos(65°−35°)\cos(65° - 35°)cos(65°−35°)
sinαcosβ−cosαsinβ\sin α \cos β - \cos α \sin βsinαcosβ−cosαsinβ
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