cos(-5π/6)和cos(-3π/4)比较大小 详细过程谢谢

cos(-5π/6)=cos(5π/6)=cos(π-π/6)=-cosπ/6cos(-3π/4)=cos(3π/4)=cos(π-π/4)=-cosπ/4cosπ/6=1/2cosπ/4=√2/2cosπ/6-cosπ/4即cos(-5π/6)>cos(-3π/4)请及时点击右下角的【好评】按钮