求下列函数的周期(1)y=2sin1/2x (2)y=cos(x+π/3) (3)y=2sin(2/3x-π/4)

问题描述:

求下列函数的周期(1)y=2sin1/2x (2)y=cos(x+π/3) (3)y=2sin(2/3x-π/4)