Question: The function f ( x , y ) = x y + 1 x + 1 y has local minimum value at ( x ,

The function f(x,y)=xy+1x+1y has local minimum value at (x,y)=
a.(1,1)
b.(0,0)
c.(-1,1)
d.(-1,-1)
e.(-1,0)
The function f ( x , y ) = x y + 1 x + 1 y has

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