2x+π/6=π/2+kπ
2x=π/3+kπ
x=π/6+kπ/2
2x+π/6=kπ
2x=kπ-π/6
x=kπ/2-π/12
对称轴是x=π/6+kπ/2 k∈z
对称中心是(kπ/2-π/12,0) k∈z