Figure 14.37 represents the level curves f(x, y) = c ;the values of f on each curve are
Chapter 14, Problem 67(choose chapter or problem)
Figure 14.37 represents the level curves f(x, y) = c ;the values of f on each curve are marked. In each of thefollowing parts, decide whether the given quantity is positive,negative or zero. Explain your answer.(a) The value of f i at P.(b) The value of f j at P.(c) f /x at Q.(d) f /y at Q
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