已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0

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已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0已知函数f(x)=Asin

已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0
已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0

已知函数f(x)=Asin(ωx+φ)(A>0,ω>0,0
已知函数f(x)=Asin(wx+φ)(A>0,w>0,0w=2π/2π=1
∴f(x)=Asin(x+π/4)==>f(π/2)=Asin(π/2+π/4)=Acosπ/4=1==>A=√2
∴f(x)的解析式为f(x)=√2sin(x+π/4)
(2)解析:∵f(θ)=√2sin(θ+π/4)=1/3,且0