y=cos(x-π/2)+sin(π/3-x)=sinx+根号下3x/2-sinx/2=sinx/2+根号下3x/2=sin(x+π/3)sinx关于 x=kπ+π/2对称所以 sin(x+π/3) 关于x+π/3=kπ+π/2 对称x=kπ+π/6)所以 y=cos(x-π/2)+sin(π/3-x)关于x=kπ+π/6)对...