Find the critical points and classify each as being a minimum, maximum, saddle point, or other, for $f ( x , y ) = x ^ { 4 } + y ^ { 4 } - 2 x ^ { 2 } - 2 y ^ { 2 }$ .

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The Answer of Find the critical points and classify each as being a minimum, maximum, saddle point, or other, for $f ( x , y ) = x ^ { 4 } + y ^ { 4 } - 2 x ^ { 2 } - 2 y ^ { 2 }$ .

Find the Critical Points and Classify Each as Being a Minimum