(x)=-√3sin^2x+sinxcosx
f(x)=-√3(1-cos2x)/2+sin2x/2
f(x)=-√3/2+√3/2*cos2x+1/2*sin2x
f(x)=-√3/2+sin60°*cos2x+cos60*sin2x
f(x)=-√3/2+sin(60°+2x)
这样比较明白了吧