lim _(xarrow infty )xsin dfrac (2x)({x)^2+1}=________.

[题目]极限 lim _(xarrow infty )xsin dfrac (2x)({x)^2+1}= __

(3) lim _(xarrow infty )xsin dfrac (x)(2{x)^2+1} ,

.lim _(xarrow infty )xsin dfrac (1)(2x)= __

极限lim _(xarrow infty )(x)^2(2-xsin dfrac (1)(x)-cos dfrac (1)(x))=A.lim _(xarrow

lim _(xarrow infty )((1-dfrac {1)(2x))}^x+2= ).A.lim _(xarrow infty )((1-dfrac {

lim _(xarrow infty )x((e)^dfrac (1{2x)}-1)==

求lim _(xarrow infty )xsin dfrac (2)(x)求

(单选题)lim _(xarrow infty )((dfrac {x-4)(x))}^2x=____lim _(xarrow infty )((dfrac {

lim _(xarrow 0)dfrac (1-{e)^(x^2)}(xsin 2x)

已知lim _(xarrow +infty )(x)^a[ sqrt ({x)^2+1}+sqrt ({x)^2-1}-2x] =bneq 0 x]=b≠0，则