Question: 2 y Suppose the red point has coordinates (a, b, f(a, b)) and the blue point has coordinates (c, d, f(c, d)). Also let u

2 y Suppose the red point has coordinates (a, b, f(a, b)) and the blue point has coordinates (c, d, f(c, d)). Also let u = ( 4, - ). Determine whether each of the following partial derivatives is positive, negative, or 0; explain briefly. (#) fx(a, b) (c) fx(c, d) (e) Da(a,b) (b) fu(a, b) (d) fy(c, d) (f) Da(c,d)

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