m=(√3sinx/4,1),n=(cosx/4,cos2x/4)f(x)=m*n=√3sinx/4*cosx/4+cos2x/4=（√3/2)*2sinx/4*cosx/4+(1/2)(1+cosx/2)=cos(π/6)sinx/2+sin(π/6)cosx/2+1/2=sin(x/2+π/6)+1/2f(x)=1sin(x/2+π/6)=1/2cos(x+π/3)=cos[...