Re: Difficulties with Re

*To*: mathgroup at smc.vnet.net*Subject*: [mg98336] Re: Difficulties with Re*From*: Peter Breitfeld <phbrf at t-online.de>*Date*: Wed, 8 Apr 2009 02:45:07 -0400 (EDT)*References*: <grcgjq$pmv$1@smc.vnet.net>

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 > Your second one will not be changed, because Mathematica considers Re[Exp(x+I y)^2] to be the simplest form. You might insert an ExpandAll to get the desired result of Exp[x^2-y^2]Cos[2 x y] -- _________________________________________________________________ Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de