已知函数f（x）=Asin（wx+φ）)(A>0,w>0,|x|0,w>0,|x|T=π==>w=2,A=3
∴f(x)=3sin(2x+φ)==> f(x)=3sin(π/6+φ)=3==>φ=π/3
∴f(x)=3sin(2x+π/3)
(2)解析：∵f(x)=3sin(2x+π/3)
2kπ-π/2