Figure 14.39 is a graph of the directional derivative, fu ,at the point (a, b) versus

Chapter 14, Problem 83

(choose chapter or problem)

Figure 14.39 is a graph of the directional derivative, fu ,at the point (a, b) versus , the angle in Figure 14.38.(a) Which points on the graph in Figure 14.39 correspondto the greatest rate of increase of f? The greatestrate of decrease?(b) Mark points on the circle in Figure 14.38 correspondingto the points P, Q, R, S.(c) What is the amplitude of the function graphed inFigure 14.39? What is its formula?

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