课前自主学案
1.cos(α-β)=__________________________ cos(α+β)=_____________________ 2.函数y=Asin(ωx+φ)(A>0,ω>0)的最大值为______,最小值为______,最小正周期为 ________.
cosαcosβ+sinαsinβ
cosαcosβ-sinαsinβ
-A