y=sin²x+根号3sinxcosx+2cos²x
=(√3/2)*2sinxcosx+cos²x+1
=(√3/2)sin2x+(1/2)cos2x-1/2+1
=sin(2x+π/6)+1/2
ymin=-1+1/2=-1/2 ymax=1+1/2=3/2
所以值域为[-1/2,3/2]
周期T=2π/2=π
y=sin²x+根号3sinxcosx+2cos²x
=(√3/2)*2sinxcosx+cos²x+1
=(√3/2)sin2x+(1/2)cos2x-1/2+1
=sin(2x+π/6)+1/2
ymin=-1+1/2=-1/2 ymax=1+1/2=3/2
所以值域为[-1/2,3/2]
周期T=2π/2=π