sin3π/4=,sin11π/4=,sin7π/4=,sin-1π/2=,sin-1π/4=
问题描述:
sin3π/4=,sin11π/4=,sin7π/4=,sin-1π/2=,sin-1π/4=
答
sin3π/4=√2/2
sin11π/4=√2/2
sin7π/4=-√2/2
sin-1π/2=-1
sin-1π/4=-√2/2