cos(α-β)=cosαcosβ+sinαsinβ
将两个已知条件平方后有
sin²α+sin²β+2sinαsinβ=3/2
cos²α+cos²β+2cosαcosβ=9/4
两式子相加
有2+2[cosαcosβ+sinαsinβ]=15/4
所以cos(α-β)=7/8
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