Find the derivative of cos3x by the first principle . Share with your friends Share 3 Lovina Kansal answered this Dear student y=cos3xLet f(x)=cos3x.Then f(x+h)=cos3x+hddx(f(x))=limh→0fx+h-fxh=limh→0cos3x+h-cos3xh=limh→0-2sin3x+3h+3x2sin3x+3h-3x2h=limh→0-2sin6x+3h2sin3h2h=-2limh→0sin6x+3h2×limh→0 sin32hh=-2sin3x×32=-3sin3x Regards 7 View Full Answer Nameer Nazeer answered this uff 3 Rinay Jain answered this Please find this answer 0
