洛必达求极限(x→0)lim(x-xcosx)的导数/(x-sinx)的导数

问题描述:

洛必达求极限(x→0)lim(x-xcosx)的导数/(x-sinx)的导数

=lim(x→0)(1-cosx+xsinx)/(1-cosx)
=lim(x→0)(sinx+sinx+xcosx)/sinx
=lim(x→0)(2sinx+xcosx)/sinx
=lim(x→0)(2cosx+cosx-xsinx)/cosx
=lim(x→0)(3cosx-xsinx)/cosx
=3

lim(x->0) (x - xcosx)/(x - sinx)= lim(x->0) (x - xcosx)'/(x - sinx)'= lim(x->0) [1 - (cosx - xsinx)]/(1 - cosx)= lim(x->0) (1 - cosx + xsinx)'/(1 - cosx)'= lim(x->0) [sinx + (sinx + xcosx)]/sinx= lim(...