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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
>
>
>
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