Question: In each case, give a possible contour diagram for the function f(x, y) if (a) f x > 0 and f y > 0 (b)

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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