(1)sin(π/4)=√2/2,所以,正弦曲线不经过(π/4,√2)
(2)sin(5π/6)=1/2,所以,正弦曲线不经过(5/6π,-√3/2)
(3)sin(4π/3)=-√3/2,所以,正弦曲线经过(4/3π,-√3/2)
(4)sin(2π)=0,所以,正弦曲线不经过(2π,1)
选C
(1)sin(π/4)=√2/2,所以,正弦曲线不经过(π/4,√2)
(2)sin(5π/6)=1/2,所以,正弦曲线不经过(5/6π,-√3/2)
(3)sin(4π/3)=-√3/2,所以,正弦曲线经过(4/3π,-√3/2)
(4)sin(2π)=0,所以,正弦曲线不经过(2π,1)
选C