Nondifferentiability? Consider the following functions f.
a. Is f continuous at (0, 0)?
b. Is f differentiable at (0, 0)?
c. If possible, evaluate fx(0, 0) and fy(0, 0).
d. Determine whether fx and fy are continuous at (0, 0).
e. Explain why Theorems 12.5 and 12.6 are consistent with the results in parts (a)–(d).
57.
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