Ejer_parcial01

(%i4)

f( x, y) : = x /( x + y) ^ 2 $
define( fx( x, y), diff( f( x, y), x)) ;
define( fy( x, y), diff( f( x, y), y)) ;
print( "fx(1,1)+fy(1,1) =", fx( 1, 1) + fy( 1, 1)) $

\begin{matrix} (%o2) & fx (x, y) := \frac{1}{{(y + x)}^{2}} - \frac{2 x}{{(y + x)}^{3}} \end{matrix}

\begin{matrix} (%o3) & fy (x, y) := - \frac{2 x}{{(y + x)}^{3}} \\ \(f_x(1,1)+f_y(1,1)\) = - \frac{1}{4} \end{matrix}

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