In each case, give a possible contour diagram for the function f(x, y) if (a) fx > 0 and
Chapter 8, Problem 23(choose chapter or problem)
In each case, give a possible contour diagram for the function f(x, y) if (a) fx > 0 and fy > 0 (b) fx > 0 and fy < 0 (c) fx < 0 and fy > 0 (d) fx < 0 and fy < 0
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