f(x)=2cos(x/2)[√3cos(x/2)-sin(x/2)]=2√3cos²(x/2)-2cos(x/2)sin(x/2)=√3(1+cosx)-sinx=√3cosx-sinx+√3=2cos(x+π/6)+√3∵f(x)=√3+1∴2cos(x+π/6)+√3=√3+1∴cos(x+π/6)=1/2又x∈[-π/2,π/2]∴x+π/6∈[-π/3,,2π/3]∴x+π/6=-π/3或x+π/6=π/3∴x=-π/2或x=π/6