Re: basic complex number question

*To*: mathgroup at smc.vnet.net*Subject*: [mg72113] Re: basic complex number question*From*: "Roman" <rschmied at gmail.com>*Date*: Wed, 13 Dec 2006 06:38:31 -0500 (EST)*References*: <eljaq8$7fm$1@smc.vnet.net>

Daniel, You can use the ComplexExpand function, which assumes that all the variables in your analytic expression are real. For example, Re[Exp[I*x]] // ComplexExpand will give the correct result, Cos[x]. Roman. Daniel Mazur wrote: > My apologies for asking a question *this* basic, but here goes: > Functions Im[] and Re[] don't really evaluate imaginary and real part of > analytical expressions. What do I need to do to get this done? > Thanks, > Daniel