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Question: Defining the derivatives for a function of two parameters

Question:Defining the derivatives for a function of two parameters

Mircode 10 Maple
April 28 2011
1

Hi!

> define( f , diff( f(x,y) , x ) = f1x(x,y) , diff( f(x,y) , y ) = f1y(x,y) );

produces

> diff( f(x,y) , x );
0

> diff( f(x,y) , y );
0

> diff( f(x,x) , x );
f1y(x,x)

So how can I do it correctly?
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