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An interactive three dimensional plot with axes labeled
\(x\text{,}\) \(y\text{,}\) and
\(z\) and a coordinate grid shown on the xy-plane. A dropdown box allows the user to select “Local Minimum” or “Local Maximum”. For the “Local Minimum” option, an upward facing circular paraboloid is shown above the xy-plane. For the “Local Maximum” option, a downward facing circular paraboloid is shown above the xy-plane.