cos(x/2)的最小周期为2π/(1/2)=4π①sin(x/3)的最小周期为2π/(1/3)=6π②设本题的函数的最小周期为θ,根据周期的定义知y(x)=y(x+θ)即cos(x/2)+2sin(x/3)=cos[(x+θ)/2]+2sin[(x+θ)/3]cos(x/2)+2sin(x/3)=cos(x/2...