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Nov10-08, 10:19 PM
Sci Advisor
HW Helper
P: 25,235
A finite difference quotient estimates the derivative, since the derivative is the limit of the difference quotient as the difference goes to zero. The given values will let you estimate the directional derivative in the direction parallel to (0.2,0.3) and (-0.1,0.1). Use those to estimate the directional derivatives in the directions (1,0) and (0,1). Which are the two partial derivatives.