T=2π/|w|=π,w>0
w=2
最小值是-2,所以|A|=|-2|,A>0,A=2
y=2sin(2x+φ)
x=2π/3,y=-2
所以sin(4π/3+φ)=-1
4π/3+φ=2kπ-π/2
φ=2kπ-11π/6
k=1,φ=π/6
所以f(x)=2sin(2x+π/6)
0