Evaluate the following limits, or explain why the limit does not exist.
In Example 4 we found that the function has stationary points at and
(a) Use the second-derivative test to show that $f$ has a saddle point at
(b) Use the second-derivative test to show that $f$ has a relative minimum at
(c) Use the value of $f(-10,0)$ to argue that $f$ has a relative minimum at and not an absolute minimum, without using the second-derivative test.
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