y=sin(2x-π/4)=0
2x-π/4=kπ
x=kπ/2+π/8
y=sin(2x-π/4)=±1
2x-π/4=kπ+π/2
x=kπ/2+3π/8
所以对称中心(kπ/2+π/8,0),对称轴x=kπ/2+3π/8