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For the following function: f(x,y)=x 4 +y 4 4xy+1 what is the nature of the critical point at (-1,-1). Local maximum Saddle point Local minimum

For the following function: f(x,y)=x⁴+y⁴4xy+1 what is the nature of the critical point at (-1,-1).

Local maximum

Saddle point

Local minimum

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