lim x→0y→2 sin(xy)/x 求极限值

求 lim(tan x-sin x)/(sin x)^3 x趋于0的极限值 求 lim (sin x)^3/ (tan x-sin x) 当x趋于0的极限值 lim[sin(xy)/xy],x趋向2,y趋向0,求极限 求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y) 求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy. 求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2 二元函数求极限：lim sin（x^2+y）/(x^2+y^2) x→0,y→0 二元函数求极限：lim (sin（x^2+y）) / (x^2+y^2) x→0,y→0 关数极限值求拯救lim[x→1]{x/(x-1)-1/log(x)} 当x趋向于0时,lim(x-1/x)^2x的极限值(求过程) 求极限lim(x→1 y→2) (x²+y²)/xy 求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤