f(x)=cos(x+θ)[cos(x+θ)-2cosθcosx]+cos^2θ
=-cos(x+θ)[sinxsinθ+cosxcosθ]+cos^2θ
=-cos(x+θ)cos(x-θ)+cos^2θ
=-(cosx)/2-(cosθ)/2+cos^2θ
f(x)的最大值1+cos^2θ-(cosθ)/2、最小值-1+cos^2θ-(cosθ)/2,最小正周期2π
f(x)=cos(x+θ)[cos(x+θ)-2cosθcosx]+cos^2θ
=-cos(x+θ)[sinxsinθ+cosxcosθ]+cos^2θ
=-cos(x+θ)cos(x-θ)+cos^2θ
=-(cosx)/2-(cosθ)/2+cos^2θ
f(x)的最大值1+cos^2θ-(cosθ)/2、最小值-1+cos^2θ-(cosθ)/2,最小正周期2π