设 lim _(xarrow 0)((x)^-3sin 3x+a(x)^-2+b)=0, 求a,b的值,

求极限；（3）lim _(xarrow 0)dfrac (sin 2x)(sin 5x)；求极限；（3）；

[题目]已知 lim _(xarrow 0)dfrac (sin 6x+xf(x))({x)^3}=0, 求 lim _(xarrow 0)dfrac (6+f

lim _(xarrow 0)dfrac (x)(x+sin x)=（）。A.2B.1C.lim _(xarrow 0)dfrac (x)(x+sin x)=D

3.问a,b为何值时,有极限-|||-lim _(xarrow 0)(dfrac (sin 3x)({x)^3}+dfrac (a)({x)^2}+b)=0-|

[题目]求极限 lim _(xarrow 0)dfrac (3sin x+{x)^2cos dfrac (1)(x)}((1+cos x)ln (1+x))

求极限lim _(xarrow 0)dfrac ({x)^3+(x)^4}(x-sin x)-|||-__求极限

求 lim _(xarrow 0)dfrac ({e)^(x^3)-1-(x)^3}({sin )^6x}= = ()

求极限: lim _(xarrow 0)((1+2x))^dfrac (1{sin 3x)}=

设lim_(x to 0) (sin 2x + xf(x))/(x^3) = 1，则lim_(x to 0) (2cos x + f(x))/(x^2) = (

[题目]-|||-求 lim _(xarrow 0)dfrac (sqrt {2+tan x)-sqrt (2+sin x)}({x)^3}