Re: Difficulties with Re

*To*: mathgroup at smc.vnet.net*Subject*: [mg98335] Re: [mg98349] Difficulties with Re*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Wed, 8 Apr 2009 02:44:56 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <200904060905.FAA26352@smc.vnet.net>*Reply-to*: murray at math.umass.edu

ComplexExpand is your friend: ComplexExpand[Re[Exp[x + I y]]] E^x*Cos[y] ComplexExpand[Re[Exp[(x + I y)^2]]] E^(x^2 - y^2)*Cos[2*x*y] Aaron Fude wrote: > Hi, > > Of the following two expressions, the first "works", while the second > doesn't. How does one make it work? > > Assuming[x > 0 && y > 0, Re[Exp[x + I y]] // Simplify] > Assuming[x > 0 && y > 0, Re[Exp[(x + I y)^2]] // Simplify] > > Many thanks in advance, > > Aaron > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**Difficulties with Re***From:*Aaron Fude <aaronfude@gmail.com>