求值:2sinπ/6+sin3π/2-2cosπ+2sinπ/3
问题描述：
求值:2sinπ/6+sin3π/2-2cosπ+2sinπ/3
答
2sinπ/6+sin3π/2-2cosπ+2sinπ/3
=2x1/2-1-2x(-1)+2x√3/2
=1-1+2+√3
=2+√3