已知f(x)=cos(2x-π/3)+sin²x-cosx
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已知f(x)=cos(2x-π/3)+sin²x-cosx
(1)求f(x)周期及对称轴方程
(2)g(x)=f²(x)+f(x),求g(x)值域
(1)求f(x)周期及对称轴方程
(2)g(x)=f²(x)+f(x),求g(x)值域
![已知f(x)=cos(2x-π/3)+sin²x-cosx](/uploads/image/z/15504808-40-8.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3Dcos%282x-%CF%80%2F3%29%2Bsin%26%23178%3Bx-cosx)
f(x)=cos(2x-π/3)+sin²x-cos^2x
=1/2cos2x+√3/2sin2x-cos2x
=√3/2sin2x-1/2cos2x
=sin(2x-π/6)
f(x)周期T=2π/2=π
对称轴方程 2x-π/6=kπ+π/2 x=kπ/2+π/3
f(x)∈[-1,1]
令f(x)=t
y=t^2+t t∈[-1,1]
=(t+1/2)^2-1/4
当t=1时,ymax=2
当t=-1/2时 ,ymin=-1/4
g(x)值域[-1/4,2]
=1/2cos2x+√3/2sin2x-cos2x
=√3/2sin2x-1/2cos2x
=sin(2x-π/6)
f(x)周期T=2π/2=π
对称轴方程 2x-π/6=kπ+π/2 x=kπ/2+π/3
f(x)∈[-1,1]
令f(x)=t
y=t^2+t t∈[-1,1]
=(t+1/2)^2-1/4
当t=1时,ymax=2
当t=-1/2时 ,ymin=-1/4
g(x)值域[-1/4,2]
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