- #1

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## Homework Statement

Find

[tex]\lim_ {(x,y,z) \rightarrow (0,0,0)} \frac{xy + 2yz^2 + 3xz^2}{x2 + y2 + z4}[/tex]

if it exists.

## The Attempt at a Solution

Not really sure how to evaluate limits with three variables, I tried letting x=y=0, then letting z approach 0. Then y=z=0, letting x approach 0. Then z=x=0, letting y approach 0. All three limits produced 0, but the answer is not 0.