1.a=(根号3msinx,cosx) b=(cosx,-mcosx)f(x)=ab=√3msinxcosx-mcosxcosx=(√3/2)msin2x-(m/2)[2(cosx)^2-1+1]=msin2xcosπ/6-mcos2xsinπ/6-m/2=msin(2x-π/6)-m/2 x∈[0,π/2]时,2x-π/6∈[-π/6,5π/6],sin(2x-π/...