Use the contour diagram for f(x, y) shown below to estimate the directional derivative of f in the direction at the point P. (a) At the point P = (2, 2) in the direction = 7, the directional derivative is approximately (b) At the point P = (2, 3) in the direction = j, the directional derivative is approximately (c) At the point P = (1,4) in the direction 7 = (i + 7)/√√2, the directional derivative is approximately (d) At the point P = (1, 0) in the direction, the directional derivative is approximately 4.8 4 3.2 2.4 1.6 0.8 0 of -0.8 2.0 -0.8 0.0 O 0 0.8 1.6 X 10.0 2.4 12.0 -2.0 3.2 16.0 18.0 14.0 8.0 4 (Click on graph to enlarge) 4.8

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