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11) Find the values of x, y, and z that correspond to the critical point of the function: f (x, y) = x3 + 2xy

11) Find the values of x, y, and z that correspond to the critical point of the function: f (x, y) = x3 + 2xy - 2x - 4y 12) Locate and describe any relative extrema or saddle points if they exist: f(x, y) = x2 - 6x + y2 + 10y+20

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