Consider
lim (x, y)→(0, 0)
x2 + y2
xy
(see figure).
(a) Determine (if possible) the limit along any line of the
form
y = ax.
(Assume
a ≠ 0.
If an answer does not exist, enter DNE.)
(b) Does the limit exist? Explain.
Yes, the limit exists. The limit is the same regardless of which
path is taken.No, the limit does not exist. Different paths result
in different limits.