sin0=0,sinπ/2=sin90=1,sinπ=sin180=0,sin3π/2=sin270=-1,sin2π=sin360=0.cos0=1,cosπ/2=cos90=0,cosπ=cos180=-1,cos3π/2=cos270=0,cos2π=cos360=1其实你记住sin与cos函数的图像就可以了,看着图这些运算结果...
sinπ,sinπ/2,sin3π/2,cosπ/2,cos-π/2,cos/2π/3 等等一系列怎么算
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