Question

π的余弦值

0,π/6,π/4,π/3,π/3,π/2,2/3π,3/4π,5/6π,π,7/6π的正弦余弦值是多少?
0,π/6，π/4，π/3，π/3，π/2，2/3π，3/4π，5/6π，7/6π，
5/4π，4/3π，3/2π，5/3π，7/4π，11/6π,2π
刚才还漏掉两个

Answer 1

sin0=0
sinπ/6=1/2
sinπ/4=√2/2
sinπ/3=√3/2
sinπ/2=1
sin2/3π=√3/2
sin3/4π=√2/2
sin5/6π=1/2
sinπ=0
sin7/6π=-1/2
sin5/4π=-√2/2
sin4/3π=-√3/2
sin3/2π=-1
sin5/3π=-√3/2
sin7/4π=-√2/2
sin11/6π=-1/2
sin2π=0
cos0=1
cosπ/6=√3/2
cosπ/4=√2/2
cosπ/3=1/2
cosπ/2=0
cos2/3π=-1/2
cos3/4π=-√2/2
cos5/6π=-√3/2
cosπ=-1
cos7/6π=-√3/2
cos5/4π=-√2/2
cos4/3π=-1/2
cos3/2π=-1
cos5/3π=1/2
cos7/4π=√2/2
cos11/6π=√3/2
cos2π=1