Question: Using the contour diagram for f(x, y) in Figure 8.45, decide whether each of these partial derivatives is positive, negative, or approximately zero. (a) f

Using the contour diagram for f(x, y) in Figure 8.45, decide whether each of these partial derivatives is positive, negative, or approximately zero.
(a) f_x(4, 1)

(b) f_y(4, 1)

(d) f_y(5, 2)

3 2 1 y 2 5 10 3 1 2 3 4

3 2 1 y 2 5 10 3 1 2 3 4 5 6 Figure 8.45 X

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