f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)=cos2xcosπ/3+sin2xsinπ/3+2sin(x-π/4)sin（x+π/4-π/2+π/2）=1/2cos2x+√3/2sin2x+2sin(x-π/4)cos(x-π/4)=1/2cos2x+√3/2sin2x+sin2(x-π/4)=1/2cos2x+√3/2sin2x...