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