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Re: Rearrangement of expression

• To: mathgroup at smc.vnet.net
• Subject: [mg91742] Re: [mg91716] Rearrangement of expression
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Sun, 7 Sep 2008 05:34:12 -0400 (EDT)
• Reply-to: hanlonr at cox.net

expr = a/Sqrt[a^2 + b^2];

Simplify[expr /. b -> a*c, a > 0] /. c -> b/a

1/Sqrt[b^2/a^2 + 1]


Bob Hanlon

---- "Gehricht at googlemail.com" <Gehricht at googlemail.com> wrote: 

=============
Hi!

Suppose I have the fraction a/Sqrt[a^2+b^2]. How can I rearrange it to
1/Sqrt[1+(b/a)^2]?
With thanks
Yours Wolfgang


--

Bob Hanlon