Re: algebraic manipulation

*To*: mathgroup at smc.vnet.net*Subject*: [mg22379] Re: [mg22349] algebraic manipulation*From*: "David Park" <djmp at earthlink.net>*Date*: Sat, 26 Feb 2000 22:05:07 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Peter, I believe that the expression you intended does automatically simplify: k*r*Cos[k*r]/(Sqrt[k]*r^3) (Sqrt[k]*Cos[k*r])/r^2 But it looks like you are using {} where you should be using [] or (). If you are in StandardForm then [] is for function arguments, () is for grouping, and {} is for Lists in any Form. So it is most likely that you have entered the expression incorrectly. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ >sorry to ask such a simple question... > >i have a very long espression of the form > > A[k, r]( B[k,r] + C[k,r] + blah blah blah) > ------------------------------------------ > D[k, r] > >it took me awhile to figure out how to decompose this (i was trying to use >Apart. instead, ExpandAll seemed to do the trick). > >but i'm still seeing terms that look like: > > k r cos(k r) > ------------- > \sqrt{k} r^{3} > >no amount of coaxing seems to make Mathematica want to reduce this to: > > \sqrt{k} \cos(k r) > ------------------ > r^{2} > >FullSimplify just undoes ExpandAll and puts everything over a common >denominator. i want separate terms which are fully reduced. > >how can i have Mathematica aggresively reduce these individual terms? > >thanks! >pete > > >