f(x)=2cos^2(x-π/6)+2sin(x-π/4)sin(x+π/4)-1
=cos(2x-π/3)-sin(2x+π/2)
=1/2*cos2x+根号3/2*sin2x+cos2x
=3/2*cos2x+根号3/2*sin2x
=根号3(cos2x-π/6)
所以函数的最小正周斯是π
函数在2kπ-π/2
f(x)=2cos^2(x-π/6)+2sin(x-π/4)sin(x+π/4)-1
=cos(2x-π/3)-sin(2x+π/2)
=1/2*cos2x+根号3/2*sin2x+cos2x
=3/2*cos2x+根号3/2*sin2x
=根号3(cos2x-π/6)
所以函数的最小正周斯是π
函数在2kπ-π/2