limx→0arctanx-x/ln(1+2x3)= _ ．
问题描述：
lim x→0
= ___ ．arctanx-x ln(1+2x3)
答
lim x→0
=arctanx-x ln(1+2x3)
lim x→0
=arctanx-x 2x3
lim x→0
=
-11 1+x2
6x2
-lim x→0
=-x2 6x2(1+x2)
1 6
lim x→0
=-1 1+x2
1 6