Simplifying Derivatives

*To*: mathgroup at smc.vnet.net*Subject*: [mg13051] Simplifying Derivatives*From*: kcrumpto at redwood.dn.hac.com (Kenneth S. Crumpton)*Date*: Sat, 4 Jul 1998 16:44:55 -0400*Sender*: owner-wri-mathgroup at wolfram.com

I am computing symbolically derivatives of orbit equations. The answers are coming out correctly but how do I keep it from substituting what various symbols are equal to ? (E.g., r = sqrt(x^2+y^2+z^2); I just want to see r in the answer and not the expansion) Thanks. Steve Crumpton Systems Engineer, Raytheon

**Follow-Ups**:**Re: Simplifying Derivatives***From:*Sean Ross <seanross@worldnet.att.net>