- #1
yecko
Gold Member
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- 15
Homework Statement
https://i.imgur.com/Wx0tkw8.jpg
(example 3b)
Homework Equations
limit of multivariable equation
Two path test
The Attempt at a Solution
My instructor told us that we should only use two paths test only if we predict there isn't any limit... but how can we 'sense' there aren't limit?? (take e.g. 3b...)
moreover, where are the two paths come from? (I don't feel like y=0 and y=-x^2 have any connection to the required function...)
any help would be appreciated~~~
thank you very much!