(1)∵与X轴相邻两个交点之间的距离为π/2
∴T/2=π/2==>T=π==>w=2π/T=2
∴f(x)=Asin(2x+π/6)
∵f(2π/3)=Asin(4π/3+π/6)=-2==>-A=-2==>A=2
∴f(x)=2sin(2x+π/6);
(2)∵X∈[0,4]
单调递增区:2kπ-π/2
(1)∵与X轴相邻两个交点之间的距离为π/2
∴T/2=π/2==>T=π==>w=2π/T=2
∴f(x)=Asin(2x+π/6)
∵f(2π/3)=Asin(4π/3+π/6)=-2==>-A=-2==>A=2
∴f(x)=2sin(2x+π/6);
(2)∵X∈[0,4]
单调递增区:2kπ-π/2