已知函数f(x)=2sin(ωx+φ),φ>0,|φ|T=2π==>w=1
f(x)=2sin(x+φ)==>f(π/4)=2sin(π/4+φ)=2==>π/4+φ=π/2==>φ=π/4
f(x)=2sin(x+π/4)