(1).f(x)=2cosx*sin(x+π/3)-√3sin^2x+sinx*cosx=2cosx(1/2sinx+√3/2cosx)-√3sin^2x+sinxcosx
=2sinxcosx+√3cos^2x-√3sin^2x=sin2x+√3cos2x=2(1/2sin2x+√3/2cos2x)=2sin(2x+π/3)
令π/2+2kπ