Entering constant placeholders

*To*: mathgroup at smc.vnet.net*Subject*: [mg32328] Entering constant placeholders*From*: "progman" <dglfl at home.com>*Date*: Tue, 15 Jan 2002 02:30:05 -0500 (EST)*Reply-to*: "progman" <dglfl at home.com>*Sender*: owner-wri-mathgroup at wolfram.com

I can't seem to make this work. When I enter the following, I get these errors: SetAttributes[a,b,c, Constant] Syntax::tsntxi: "SetAttributes a,constant" is incomplete; more input is needed. d(ax^3 + bx^2 + cx + d)/dx The answer should be 3ax^2+2bx+c . I can't figure out how to tell mathematica that a,b, & c are constants. Thanks

**Follow-Ups**:**RE: Entering constant placeholders***From:*"Higinio Ramos" <higra@usal.es>