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Re: Difficulties with Re

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98320] Re: [mg98349] Difficulties with Re
  • From: "David Park" <djmpark at comcast.net>
  • Date: Wed, 8 Apr 2009 02:42:14 -0400 (EDT)
  • References: <8797377.1239009212704.JavaMail.root@n11>

Why don't you use ComplexExpand?

ComplexExpand[Re[Exp[(x + I y)^2]]]
E^(x^2 - y^2) Cos[2 x y]


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: Aaron Fude [mailto:aaronfude at gmail.com] 

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




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