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\text { 2) Consider the surface } z=f(x, y)=x y-y^{2} \text {. } a) Find the derivative of f at (1,2,-2) in the direction i ++j. Showwork.your b) Find the equation of the tangent plane to f at the point (1, 2,-2), anduse it to approximate the value of f(1.1, 1.95).

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