Re: Algebraic Manipulation
- To: mathgroup at smc.vnet.net
- Subject: [mg46172] Re: Algebraic Manipulation
- From: bobhanlon at aol.com (Bob Hanlon)
- Date: Tue, 10 Feb 2004 00:05:39 -0500 (EST)
- References: <c07p9h$kmc$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
expr=x*y*(-(z^2/(r^2*(x^2+y^2)))-1/(r*(k+r))+1/(x^2+y^2)); Simplify[expr, r^2==x^2+y^2+z^2] (k*x*y)/(r^2*(k + r)) Bob Hanlon In article <c07p9h$kmc$1 at smc.vnet.net>, "David Park" <djmp at earthlink.net> wrote: << expr = x*y*(-(z^2/(r^2*(x^2 + y^2))) - 1/(r*(k + r)) + 1/(x^2 + y^2)) where r^2 == x^2 + y^2 + z^2 reduces to (k*x*y)/(r^2*(k + r)) I wonder if anyone can show an elegant or short method to do the simplification?