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1 Show that the limit lim _——— does not exist /4xy(ve 10

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1 Show that the limit lim _——— does not exist
/4xy(ve 10.0) x ²+ y²
2 Determine the equation of the plane tangent to the surface f(x,y) = RD -x²-y² atthe
point (2,-1,2).
3) (6 points} Determine all second partial derivatives of the function I(x y) =x sin{xy) .