f(x)=cos(2x-π/3)+cos(2x+π/6)
=cos(2x-π/3)+sin(-2x+π/3)
=cos(2x-π/3)-sin(2x-π/3)
=√ 2cos(2x-π/3+π/4)
=√ 2cos(2x-π/12)
所以函数f(x)的最大值为 √2,最小正周期为π
f(x)=cos(2x-π/3)+cos(2x+π/6)
=cos(2x-π/3)+sin(-2x+π/3)
=cos(2x-π/3)-sin(2x-π/3)
=√ 2cos(2x-π/3+π/4)
=√ 2cos(2x-π/12)
所以函数f(x)的最大值为 √2,最小正周期为π