' - - File: IV_Par1.txt   
'Find the partial derivatives of a two-parameter function.

Ac{u,v} = u^3 * Sin[5*v]

Au{u,v} = Diff[Ac,u]              ' Partial with respect to u.
Av{u,v} = Diff[Ac,v]               ' Partial with respect to v.

'Take the second-order partials with respect to the opposite variable:

Bv{u,v} = Diff[Au,v]               ' Partial u followed by v.
Bu{u,v} = Diff[Av,u]               ' Partial v followed by u.

<u = 3.047 ; v = 5.263>

' Functions of more than one variable CAN NOT be placed in a vector format using Plot[.
' This restriction will be modified in Unit VII on directed field graphs.



