Understanding the Limit of 2 Variables (x,y) -> (0,0) for (x^2)(y)/((x^4)+(y^2))

[MAins]

What is:
lim(x,y)->(0,0) of (x^2)(y) / ((x^4) + (y^2)) ?

When I take x_n = 0, y_n = 1/n, lim=0
and x_n = 1/n, y_n = 0, lim=0
and x_n = y_n = 1/n, lim=0
All three limits are zero, yet other people I've asked say the limit doesn't
exist. Am I right, or am I doing something wrong here? Thanks.

 

[rocomath]

\lim_{(x,y) \rightarrow (0,0)}\frac{x^2y}{x^4+y^2}x=0
\lim_{(x,y) \rightarrow (0,0)}\frac{0\cdot y}{0+y^2}=0y=0
\lim_{(x,y) \rightarrow (0,0)}\frac{x^2\cdot 0}{x^4+0}=0y=x^2
\lim_{(x,x^2) \rightarrow (0,0)}\frac{x^4}{2x^4}=\frac 1 2

Aim to make your powers the same, use y=x^2 or x=y^2.

General tests:

x=y=0
y=x
x=y^n
y=x^n