lim(x^2+y^2)sin(1/(x^2+y^2))
lim sin(y×x^2+y^4)/(x^2+y^2) x,y都趋于0,
证明下列极限不存在(1) Lim x+y/x-y (2)lim x²y²/ x²y&sup
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
lim(x→0y→1)(1+xe^y)^(2y+x/x)求极限
求极限 lim x→0 y→0[x^2+y^2+5/x+y sin(x+y)] 不懂极限,
求导:x^2*y^2 + x sin(y) = 1
化简sin(2x-y)*sin y+cos(2x-y)*sin y
lim tan x - sin x / x³ lim eˆ2x - 1 / x
lim(x趋向0)ln(1+sin x)/x^2
lim(sin(x^2*cos(1/x)))/x怎么做?
求极限lim(x-->0)x^2 sin(1/x),