化简f(x)=cos(2x-π/3)-cos2x

化简f(x)=cos(2x-π/3)-cos2x
化简f(x)=cos(2x-π/3)-cos2x

化简f(x)=cos(2x-π/3)-cos2x
和差化积公式
cos(a)-cos(b) = -2sin[(a+b)/2]sin[(a-b)/2]
f(x)=cos(2x-π/3)-cos2x=-2sin(2x-π/6)sin-π/6
=sin(2x-π/6)