Find the Local Maximum and Minimum Values and Saddle Points$f ( x , y ) = 4 x y - x ^ { 4 } - y ^ { 4 } + \frac { 1 } { 16 }$

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The Answer of Find the Local Maximum and Minimum Values and Saddle Points$f ( x , y ) = 4 x y - x ^ { 4 } - y ^ { 4 } + \frac { 1 } { 16 }$

Find the Local Maximum and Minimum Values and Saddle Points $f ( x , y ) = 4 x y - x ^ { 4 } - y ^ { 4 } + \frac { 1 } { 16 }$