sin2/3π=? sin5/6π=? sin7/6π=? sin(-π/3)=?
问题描述:
sin2/3π=? sin5/6π=? sin7/6π=? sin(-π/3)=?
答
sin2/3π=√3/2
sin5/6π=1/2
sin7/6π=-1/2
sin(-π/3)=-√3/2