(1)由题意,A=3,最小正周期T=2(6π-π)=10π,所以ω=2π/T=1/5,
由当x=π时,3sin(π/5+φ)=3,所以π/5+φ=2kπ+π/2,得φ=2kπ+3π/10,因0≤φ≤π/2,所以φ=3π/10.
所以y=3sin(1/5x+3π/10)
(2)2kπ-π/2
(1)由题意,A=3,最小正周期T=2(6π-π)=10π,所以ω=2π/T=1/5,
由当x=π时,3sin(π/5+φ)=3,所以π/5+φ=2kπ+π/2,得φ=2kπ+3π/10,因0≤φ≤π/2,所以φ=3π/10.
所以y=3sin(1/5x+3π/10)
(2)2kπ-π/2