已知函数f(x)=sin²ωx+根号3sinωxsin(ωx+π/2)(ω>0)的最小正周期为π(1)求ω的值(2)求函数f(x)在区间[0,2π/3]上的取值范围如果可以请写出具体过程,
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![已知函数f(x)=sin²ωx+根号3sinωxsin(ωx+π/2)(ω>0)的最小正周期为π(1)求ω的值(2)求函数f(x)在区间[0,2π/3]上的取值范围如果可以请写出具体过程,](/uploads/image/z/5910940-28-0.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dsin%26%23178%3B%CF%89x%2B%E6%A0%B9%E5%8F%B73sin%CF%89xsin%28%CF%89x%2B%CF%80%2F2%29%EF%BC%88%CF%89%EF%BC%9E0%EF%BC%89%E7%9A%84%E6%9C%80%E5%B0%8F%E6%AD%A3%E5%91%A8%E6%9C%9F%E4%B8%BA%CF%80%EF%BC%881%EF%BC%89%E6%B1%82%CF%89%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82%E5%87%BD%E6%95%B0f%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%5B0%2C2%CF%80%2F3%5D%E4%B8%8A%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E5%A6%82%E6%9E%9C%E5%8F%AF%E4%BB%A5%E8%AF%B7%E5%86%99%E5%87%BA%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B%2C)
已知函数f(x)=sin²ωx+根号3sinωxsin(ωx+π/2)(ω>0)的最小正周期为π(1)求ω的值(2)求函数f(x)在区间[0,2π/3]上的取值范围如果可以请写出具体过程,
已知函数f(x)=sin²ωx+根号3sinωxsin(ωx+π/2)(ω>0)的最小正周期为π
(1)求ω的值
(2)求函数f(x)在区间[0,2π/3]上的取值范围
如果可以请写出具体过程,
已知函数f(x)=sin²ωx+根号3sinωxsin(ωx+π/2)(ω>0)的最小正周期为π(1)求ω的值(2)求函数f(x)在区间[0,2π/3]上的取值范围如果可以请写出具体过程,
答:
参考回答:
http://zhidao.baidu.com/link?url=CN25jBgilZ5FSeDsyk4aKy4tYeFe_fiLipJsYj-IYTX4UhWrtRkA--TGBUhzpgxJ11UjtfPjP03placKgP5Zza
f(x)=sin²ωx+根号3sinωxsin[ωx+π/2]
=1/2-(1/2)cos2wx+√3sinwxcoswx
=(√3/2)sin2wx-(1/2)cos2wx+1/2
=sin(2wx-π/6)+1/2
(1) 最小正周期T=2π/2w=π w=1
(2)
x∈[0,2π/3] 2x-π/6∈[-π/6, 7π/6]
sin(2x-π/6)∈[-1/2, 1]
f(x)的值域为[0, 3/2]
(1)f(x)=1/2-1/2cos2wx+√3/2sin2wx=sin2wxcos(-π/6)+cos2wxsin(-π/6)+1/2
=sin(2wx-π/6)+1/2
最小正周期为π 2π /2w=π w=1
(2)x在[0,2π/3],则 -π/6 ≤ 2x-π/6≤7π/6
-1/2≤sin(2x-π/6)≤1
0≤f(x)≤3/2