sin^2(α)+cos(30°-a)-sinacos(30°-a)=?
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sin^2(α)+cos(30°-a)-sinacos(30°-a)=?sin^2(α)+cos(30°-a)-sinacos(30°-a)=?sin^2(α)+cos(30°-a)-sinacos(
sin^2(α)+cos(30°-a)-sinacos(30°-a)=?
sin^2(α)+cos(30°-a)-sinacos(30°-a)=?
sin^2(α)+cos(30°-a)-sinacos(30°-a)=?
sin²(a)+cos(30°-a)-sinacos(30°-a)
=sin²(a)+cos30°cosa+sin30°sina-sina(cos30°cosa+sin30°sina)
=sin²(a)+(√3/2)cosa+(1/2)sina-(√3/2)sinacosa-(1/2)sin²(a)
=(√3/2)cosa+(1/2)sina-(√3/2)sinacosa+(1/2)sin²(a)
=cos(30°-a)-sinacos(30°+a)
sin^2(α)+cos(30°-a)-sinacos(30°-a)=?
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