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Re: Difficulties with Re

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98323] Re: Difficulties with Re
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Wed, 8 Apr 2009 02:42:46 -0400 (EDT)

On 4/6/09 at 5:05 AM, aaronfude at gmail.com (Aaron Fude) wrote:

>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]

Is the following adequate for you?

In[9]:= Assuming[x > 0 && y > 0,
  Re[Exp[(x + y I )^2 // Expand]] // Simplify]

Out[9]= E^(x^2 - y^2)*Cos[2*x*y]



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