∵7π/6=π+π/6sin7π/6=sin(π+π/6)=-sinπ/6=-1/2cos7π/6=cos(π+π/6)=-cosπ/6=-√3/2tg7π/6=tg(π+π/6)=tgπ/6=√3/3方法二：在单位圆上,半径=1转到7π/6时,半径的端点（-√3/2,-1/2）sin7π/6=对边/斜边=...