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Error in FullSimplify

• To: mathgroup at smc.vnet.net
• Subject: [mg122935] Error in FullSimplify
• From: Philipp Weißgraeber at smc.vnet.net
• Date: Thu, 17 Nov 2011 06:04:30 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hello

I have experienced some strange error in the FullSimplify-function in 
Mathematica 7.

Input:
(-E^((a+b I)x)+E^((a-b I)x)+E^((-a+b I)x)-E^((-a-b I)x))/.a->3 /.b->4 // 
FullSimplify
(-E^((a+b I)x)+E^((a-b I)x)+E^((-a+b I)x)-E^((-a-b I)x))/.a->3. /.b->4. 
// FullSimplify

Output:
-4 I Sin[4 x] Sinh[3 x]
-2 I Sin[4. x] Sinh[3. x]

And the later result is wrong.

What happens here, how can this be explained?

CU

Philipp

• Follow-Ups:
  • Re: Error in FullSimplify
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: Error in FullSimplify
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>