周期为 2π/(2/3)=3π
相邻对称轴间的距离是半个周期 =3π/2请问可以说一下过程吗？f（x）=cos（2/3x+π/2）+cos2/3x =-sin(2/3 x)+cos(2/3)x=-√2sin(2/3x-π/4)周期为 2π/(2/3)=3π相邻对称轴间的距离是半个周期 =3π/2