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(b) ``Small'' disturbance approximations
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(a) Partial Derivative
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(a) Partial Derivative
Examples:
(1)
f
(
x
,
z
) =
x
+ 2
z
+
xz
(2)
For x=1, z=1,
f
(1,1) = 2
For
,
approximate the value of
:
Exact value is
Soon Woong Chang
Wed Sep 29 15:22:46 CDT 1999
, 
approximate the value of 
:
