Like x tends to 0. Cos mx - cos nx/x^2 Share with your friends Share 4 Neha Sethi answered this Dear student limx→0cosmx-cosnxx2Apply L hopitals rule=limx→0-msinmx+nsinnx2xApply L hopitals rule=limx→0-m2cosmx+n2cosnx2Put x=0, we get=-m2cosm0+n2cosn02=n2-m22 Regards 3 View Full Answer
