limx→0[arctanx/ln(1+2x)]=____.
1/2 分析:x→0,x~arctanx,所以limx→0[arctanx/ln(1+2x)]=limx→0[x/ln(1+2x)]= limx→0[1/ln(1+2x)1/x]=limx→01/In[(1+2x)1/2x]2=1/lne2=1/2
limx→0[arctanx/ln(1+2x)]=____.
1/2 分析:x→0,x~arctanx,所以limx→0[arctanx/ln(1+2x)]=limx→0[x/ln(1+2x)]= limx→0[1/ln(1+2x)1/x]=limx→01/In[(1+2x)1/2x]2=1/lne2=1/2