((2x-y2) Let f(x, y) = x² + y² (x, y) = (0,0) 2, (x, y) = (0,0) Are fx and fy continuous at (0,0)? Is lim (Ax,Ay)→(0,0) ƒ(a+ªx,b+ªy)—ƒ(a,b)—ƒx(a,b)^x-fy(a,b)▴y (Ax)²+(Ay)² = 0?

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