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If $\lim _{(x, y) \rightarrow\left(x_{0}, y_{0}\right) \rightarrow\left(x_{0}, y_{0}\right)} f(x, y)=L,$ must $f$ be defined at $\left(x_{0}, y_{0}\right) ?$ Give reasons for your answer.
No, $f$ cannot be defined at $\left(x_{0}, y_{0}\right)$ because the limit depends upon the values of$f(x, y)$when $(x, y) \neq\left(x_{0}, y_{0}\right)$
Calculus 3
Calculus 1 / AB
Chapter 14
Partial Derivatives
Section 2
Limits and Continuity in Higher Dimensions
Applications of the Derivative
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