已知函数f(x)=sin^2(x-π/6)+sin^2(x+π/6)(1)求函数f(x)最小正周期(2)x∈[-π/3,

问题描述:

已知函数f(x)=sin^2(x-π/6)+sin^2(x+π/6)(1)求函数f(x)最小正周期(2)x∈[-π/3,π/6],求函数值域
1个回答 分类:数学 2014-11-23

问题解答:

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f(x)=(1/2)[1-cos(2x-π/3)]+(1/2)[1-cos(2x+π/3)]
=1-[cos(2x-π/3)+cos(2x+π/3)]
=1-2cos2xcos(π/3)
=1-cos2x
(1)周期为T=2π/2=π;
(2)f(x)在[-π/3,0]上是减函数,在[0,π/6]上是增函数,
最大值为f(-π/3)=3/2,最小值为f(0)=0
 
 
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