lim（x ->0）sin x /x ^3+3x

lim（x ->0）sin x /x ^3+3x lim x趋于0 （x-sin x）/x^3 lim x^sin x （x趋于0-） lim （x→0）x sin 1/x= Lim*（sin x/tan x）x->0 lim x->0 (sin x-tan x)/sin (x^3) lim(x(sin)^2) lim(x→0)×(x-sin²3x)/x lim (x->0) sin(3x)+4x/xsec(x) lim (x->0) [tan(tan x)-sin(sin x)]/(tan x -sin x) 求极限,lim x趋于0 x * sin 1/x lim(x趋向0)ln(1+sin x)/x^2 求极限lim(x-->0)x^2 sin(1/x), lim(x趋向0) x^2 / (sin^2) * x/3 lim (x→0+)sin x/x= lim(x趋向0) x^2 / (sin^2) * x/3 lim(1/（x^2-x)）*sin(π/x）x趋向于0请详解 lim(tan^3(3x)/(X^2sin(2x))(x趋近于0）