Rearrangement of expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg91716] Rearrangement of expression*From*: "Gehricht at googlemail.com" <Gehricht at googlemail.com>*Date*: Sat, 6 Sep 2008 02:08:02 -0400 (EDT)

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