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(a) Partial Derivative

figure195

tex2html_wrap_inline603 Partial derivative of f w.r.t. x:

equation200

tex2html_wrap_inline603 Partial derivative of f w.r.t. z:

equation207

tex2html_wrap_inline603 For ``small'' tex2html_wrap_inline617 , tex2html_wrap_inline619

equation214





Soon Woong Chang
Wed Sep 29 15:22:46 CDT 1999