y=(sinx+cosx)²+1=1+2sinxcosx+1=2+sin2x最正丛嫌誉小正周期:2π/ω=2π/举者樱2=π
y=sin²x+cos8x+2sinxcosx+1=1+sin2x+1所以T=2π/2=π
y=2sinxcosx+2=sin2x+2最小正周期为pai
y=(sinx+cosx)²+1=sinx²漏穗迹族谈+cosx²返并+2sinxcosx+1=2+2sin2x周期为3.14