f(x)=2√3sin(wx+π/3)(w〉0),f(x+θ)是周期为2π的偶函数.求w及θ值
解析:∵函数f(x)=2√3sin(wx+π/3) (w>0)
2√3sin(wx+π/3)=2√3sin[w(x+π/(2w)-π/(3w))+π/3]=2√3sin[wx+π/2-π/3+π/3]
=2√3cos[wx],为偶函数
∵f(x+θ)是周期为2π的偶函数
∴w=2π/2π=1==>θ=π/(2w)-π/(3w)=π/(2)-π/(3)=π/6
f(x)=2√3sin(wx+π/3)(w〉0),f(x+θ)是周期为2π的偶函数.求w及θ值
解析:∵函数f(x)=2√3sin(wx+π/3) (w>0)
2√3sin(wx+π/3)=2√3sin[w(x+π/(2w)-π/(3w))+π/3]=2√3sin[wx+π/2-π/3+π/3]
=2√3cos[wx],为偶函数
∵f(x+θ)是周期为2π的偶函数
∴w=2π/2π=1==>θ=π/(2w)-π/(3w)=π/(2)-π/(3)=π/6