lim _(xarrow 0)dfrac (sin 4x)(sin x)= )-|||-__lim _(xarrow 0)dfrac (sin 4x)(sin
一、设f(z)=(1)/(2i)((z)/(overline(z))-(overline(z))/(z)),z≠0.试证:当z→0时,f(z)的极限不存在.一、
(3) lim _(xarrow 0)(dfrac (1)(x)sin x-xsin dfrac (1)(x))= () .-|||-(A) -1 (B)1 (
(3.)求下列极限:-|||-(1) lim _(xarrow infty )dfrac (1)(1+{z)^2} ;-|||-(3) lim _(zarrow
3.试证明:极限 lim _(narrow infty )sin dfrac (npi )(2) 不存在.
lim _(xarrow {0)^-}(e)^dfrac (1{x)}=-|||-()
极限lim _(xarrow 0)dfrac ({int )_(0)^(x^2)(e)^tdt}(2x)=()A、 lim _(xarrow 0)dfrac (
2.[单选题] lim _(xarrow 1)dfrac ({z)^2+z-2}(z-1)=-|||-()()-|||-bigcirc A.1-|||-big
4.证明:(1) lim _((x,y)arrow (0,0))dfrac (x+y)(x-y) 不存在;(2)-|||-lim _((x,y)arrow (0
[题目] lim _(xarrow infty )dfrac (x+sin x)(x)=()-|||-A.0-|||-B.1-|||-C.不存在-|||-D.无