设F（X）=g(x)+h(x)+1/4g（x)=cos(π/3+x)cos(π/3-x)=[cosπ/3cosx－sinπ/3sinx][cosπ/3cosx+sinπ/3sinx]=[1/2cosx－√3/2sinx][1/2cosx+√3/2sinx]=1/4cos²x－3/4sin²x=1/4cos²x－3/4(1-cos...