ku Posted February 20, 2005 Posted February 20, 2005 [math]U = f(x,y)[/math] Can someone explain to me how [math]\frac{dy}{dx}=-\frac{\partial{U}/\partial{x}}{\partial{U}/\partial{y}}[/math]? _______________ http://members.fortunecity.com/ku20/oldindex.html
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