Kneel for the analytical method of the ninth problem of mathematics in the new curriculum standard of national college entrance examination on 20 12?
Since the straight lines x=pi/4 and 5pi/4 are two adjacent symmetry axes of the image of the function f(x), the minimum positive period t of f(x) is 2pi, so w= 1. So pi/4+@=kpi+pi/2, and 0