f(x)=2分之根号3cosx+2分之1sinx(x∈R)
=sinπ/3cosx+cosπ/3sinx
=sin(x+π/3)
所以
最大值=1
此时x+π/3=2kπ+π/2
x=2kπ+π/6
即集合为{x|x=2kπ+π/6,k∈Z}