Question: 4. Does the following limit exist? :ry2 1 lim 5. Let 0, if sr2 < y < 2:r2 1, otherwise. Show that O) and


4. Does the following limit exist? :ry2 1 lim 5. Let 0, if sr2 < y < 2:r2 1, otherwise. Show that O) and O) exists, but f is not differentiable at (O, O).
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