Find and classify the relative extrema and saddle points of the function $f ( x , y ) = x ^ { 2 } + 2 y ^ { 2 } + x ^ { 2 } y + 13$ .

Name: Find and classify the relative extrema and saddle points of the function $f ( x , y ) = x ^ { 2 } + 2 y ^ { 2 } + x ^ { 2 } y + 13$ .
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The Answer of Find and classify the relative extrema and saddle points of the function $f ( x , y ) = x ^ { 2 } + 2 y ^ { 2 } + x ^ { 2 } y + 13$ .

Find and Classify the Relative Extrema and Saddle Points of the Function