Find the critical points (if any) for $f ( x , y ) = \frac { 1 } { x } + \frac { 1 } { y } + x y$ and determine if each is a local extreme value or a saddle point.

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The Answer of Find the critical points (if any) for $f ( x , y ) = \frac { 1 } { x } + \frac { 1 } { y } + x y$ and determine if each is a local extreme value or a saddle point.

Find the Critical Points (If Any) For f(x,y)=1x+1y+xyf ( x , y ) = \frac { 1 } { x } + \frac { 1 } { y } + x yf(x,y)=x1​+y1​+xy

Find the Critical Points (If Any) For $f ( x , y ) = \frac { 1 } { x } + \frac { 1 } { y } + x y$