求极限lim (sinxy) / y x->a y->0

求极限lim (sinxy) / y x->a y->0 lim(x,y)趋近于(0,0)(xy^2-sinxy^2)/(x^3*y^6)= 求导数：e^x-e^y=sinxy lim(x,y→2,0)sinxy/[√(xy+1-)1] 求极限lim[(sinx-siny)/(x-y)]x趋向y sinxy+ln(y+x)=x求导 求导数 y=f(x)由方程x2+sinxy=1确定,求y' lim(x→0y→1)(1+xe^y)^(2y+x/x)求极限 求极限lim(x→+∞,y→+∞) (X+Y)/(X^2-Y^2) lim((x-y)/(x+y))求极限.(x,y)→(0,0) 求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy.求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy, xy趋近于0时sinxy/x极限 求极限：lim (x^2+y^2)^xy（x,y）lim (x^2+y^2)^xy x,y→0 这个极限是多少啊!怎么算? lim(xy/(x^2+y^2))^x^2 x,y趋近无穷 求极限 求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2 Lim(Sinx-siny/x-y)极限 lim x-0 sin2x/x 求极限 lim(x->0)arctan1/x求极限