Chapter 8.4, Problem 23P

To determine

(a)

To estimate:

$f_x(2,1)$ and $f_y(2,1)$ using the contour diagram for f.

To determine

(b)

To estimate:

$f_x(2,1)$ and $f_y(2,1)$ using table values for f with $x=1.9,2,2.1$ and $y=0.9,1,1.1$.

To determine

(c)

To estimate:

$f_x(2,1)$ and $f_y(2,1)$ by algebraically.