已知函数f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)(w>0)最小正周期为派①求函数f(x)的单调递增区间及对称中心坐标②求函数f(x)在区间【0,2π/3】的取值范围
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已知函数f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)(w>0)最小正周期为派①求函数f(x)的单调递增区间及对称中心坐标②求函数f(x)在区间【0,2π/3】的取值范围已知
已知函数f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)(w>0)最小正周期为派①求函数f(x)的单调递增区间及对称中心坐标②求函数f(x)在区间【0,2π/3】的取值范围
已知函数f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)(w>0)最小正周期为派
①求函数f(x)的单调递增区间及对称中心坐标
②求函数f(x)在区间【0,2π/3】的取值范围
已知函数f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)(w>0)最小正周期为派①求函数f(x)的单调递增区间及对称中心坐标②求函数f(x)在区间【0,2π/3】的取值范围
f(x)=2sin^2(wx)+2根号3sinwxsin(π/2-wx)
=1-cos(2wx)+2√3sinwx*cos(wx)
=√3sin(2wx)-cos(2wx)+1
=2sin(2wx-π/6)+1
周期为T=2π/(2w)=π
∴ w=1
∴ f(x)=2sin(2x-π/6)+1
(1)2kπ-π/2≤2x-π/6≤2kπ+π/2
即 kπ-π/6≤x≤kπ+π/3
增区间是[kπ-π/6,kπ+π/3],k∈Z
2x-π/6=kπ
∴ x=kπ/2+π/12
即中心(kπ/2+π/12,0)
(2)
x∈[0,2π/3]
2x-π/6∈[-π/6,7π/6]
∴ sin(2x-π/6)∈[-1/2,1]
即 f(x)∈[0,3]
ps:咋都半夜问啊.
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