7.Determine the signs of the partial derivatives for the function f whose graph is shown below.
(a) fxx(−x0, y0)
(b) fyy(−x0, y0)
8. Determine the signs of the partial derivatives for the function f whose graph is shown below.
(a) fx(−x0, y0)
(b) fy(−x0, y0)
9. Determine the signs of the partial derivatives for the function f whose graph is shown below.
(a) fx(x0, y0)
(b) fy(x0, y0)
10. Determine the signs of the partial derivatives for the function f whose graph is shown below.
(a) fxy(x0, y0)
(b) fxy(−x0, y0)
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