Taking the Arg of a complex number

*To*: mathgroup at smc.vnet.net*Subject*: [mg122083] Taking the Arg of a complex number*From*: Ben <bjgear at googlemail.com>*Date*: Wed, 12 Oct 2011 03:44:50 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Reply-to*: comp.soft-sys.math.mathematica at googlegroups.com

Would appreciate any help here, endless Googling has not revealed the answer to me: If I define a complex number symbolically, such as x = A Exp[I phi], why does Arg[x] never return the answer I expect, phi? Using Refine with the as sumptions phi is real and between 0 and 2 pi, and that A is greater than 0 doesn't seem to help. All I get is Arg[Exp[I phi]]

**Follow-Ups**:**Re: Taking the Arg of a complex number***From:*Jacopo Bertolotti <jacopo.bertolotti@gmail.com>