acosC＋√3asinC-b-c＝0根据正弦定理a＝2RsinA,b＝2RsinB,c＝2RsinC∴sinAcosC＋√3sinAsinC－sinB－sinC＝0（＊）∵sinB＝sin［180º－（A＋C）］＝sin（A＋C）＝sinAcosC＋cosAsinC∴（＊）可化为sinAcosC＋√...