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cos(A-兀/6)+sinA =√3/2cosA+3/2sinA =√3(1/2cosA+√3/2sinA)=(4√3)/5所以:(1/2cosA+√3/2sinA)=4/5 sin(A+7兀/6)=-sin(A+兀/6)=-(√3/2sinA+1/2cosA)=-4/5
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