Define f(0,0) in a way that extends f(x,y)= (3x^2-x^2y+3y^2)/(x^2+y^2) to be continous at the origin.
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Define f(0,0) in a way that extends f(x,y)= (3x^2-x^2y+3y^2)/(x^2+y^2) to be continous at the origin.
Define f(0,0) in a way that extends f(x,y)= (3x^2-x^2y+3y^2)/(x^2+y^2) to be continous at the origin.