variables versus functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg28797] variables versus functions*From*: Julian Sweet <jsweet at engineering.ucsb.edu>*Date*: Sun, 13 May 2001 03:28:46 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

How is it different to define a variable such as A=Cos[x] versus a function A[x_]:=Cos[x] ? Furthermore, what If I define two functions A[x_]:=Cos[x] and B[x_]=ArcTan[x]? How would FindRoot[A==B,{x,pi/2}] treat this differently than if I just used variable definitions for A & B? e-mail response appreciated: jsweet at engineering.ucsb.edu