sin(π-x)=sinx
偶函数即为当x=-x时,y不变.
sin(-2x+π/4)=sin(π-(-2x+π/4))=sin(2x-3π/4),可以看出图像向右平移π/4或者向左平移3π/4后即为偶函数,y=sin(2x+π/2)或y=sin(2x-π/2).
sin(π-x)=sinx
偶函数即为当x=-x时,y不变.
sin(-2x+π/4)=sin(π-(-2x+π/4))=sin(2x-3π/4),可以看出图像向右平移π/4或者向左平移3π/4后即为偶函数,y=sin(2x+π/2)或y=sin(2x-π/2).