sin2/3π=? sin5/6π=? sin7/6π=? sin(-π/3)=?

问题描述:

sin2/3π=? sin5/6π=? sin7/6π=? sin(-π/3)=?

sin2/3π=√3/2
sin5/6π=1/2
sin7/6π=-1/2
sin(-π/3)=-√3/2