У x Suppose the red point has coordinates (a, b, f(a, b)) and the blue point has coordinates (c, d, f(c,d)). Also let û = (-) Determine whether each of the following partial derivatives is positive, negative, or 0; explain briefly. (a) f(a,b) (b) f(a, b) (c) f. (c,d) (d) fy(c,d) (e) Da (a,b) (f) Da(c,d)

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