f(x)=√3cosxsinx-1/2cos2x f(x)=(2cos²x-1)sin2x+1/2cos4x -----------------------

问题描述:

f(x)=√3cosxsinx-1/2cos2x f(x)=(2cos²x-1)sin2x+1/2cos4x -----------------------

f(x)=√3cosxsinx-1/2cos2x
=√3/2sin2x-1/2cos2x
=sin(2x-π/6)