(sinα-sinβ)=1-√3/2(sinα-sinβ)²=(1-√3/2)²sin²α-2sinαsinβ+sin²β=7/4 -√3 (1)cosα-cosβ=-1/2(cosα-cosβ)²=1/4cos²α-2cosαcosβ+cos²β=1/4...