Question: ( d ) f ( x , y ) = { x y x 2 + x y + y 2 i f ( x

(d)
f(x,y)={xyx2+xy+y2if(x,y)(0,0)0if(x,y)=(0,0)
( d ) f ( x , y ) = { x y x 2 + x y + y 2 i f ( x

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