f(x)=5(sinπ/6sin2x-cosπ/6cos2x)= 5sin(2x-π/6) sin(2x-π/6)=±1时,2x-π/6=kπ+π/2∴对称轴:x=kπ/2+π/3,其中k属于Z sin(2x-π/6)=0时,2x-π/6=kπ,x=kπ/2+π/12∴对称中心:(kπ/2+π/12,0),其中k属于Z