Limx→0y→0sin(xy)/y

Limx→0y→0sin(xy)/y limx趋近于0y趋近于0sin(xy)/x求极限. 求下列极限 1.lim x→0y→2 sin(xy)/x 2.lim x→0y→0 (2-√（xy+4）)/xy3.lim x→0y→0(x^2y)/(x^3-y^3) 4.limx→0y→1 xy*sin(1/(x^2+y^2)) limx->0,y->0(xy/(x^2+y^2))^2 limx趋近0,y趋近0 (x^2+y^2)^xy 当（x,y）→（0,2）时,sin xy/xy的极限为? x→2,y→0,求lim sin[(8 -x)y]/xy=多少呀? limx→2 y→0 ln(x+e*y)/根号(x*2+y*2) limx→0 sin［sin（sinx）］/x x→0,y→0 ［2-√（xy+4）］/xy的极限.x→2,y→0 sin（xy）/y的极限 limx→0 tan(tanx)-sin(sinx)/x^3 limx→0x/Sin(x/2)的极限是什么 limx→0[sinx-sin(sinx)]sinx/x^4 limx→0(sin³x/sinx³)= 当(x,y)→(0,2),求sin xy/x的二重极限!详细步骤啊. lim x→0y→2 sin(xy)/x 求极限值解题时为什么把sin直接省去了 求极限limx→0 (cosx)^1/sin^2x求极限limx→0 (cosx)^(1/sin^2x) xy-sin(πy^2)=0 求dy/dx