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Re: Simply derivative question, Math 5.

• To: mathgroup at smc.vnet.net
• Subject: [mg50253] Re: [mg50240] Simply derivative question, Math 5.
• From: "David Park" <djmp at earthlink.net>
• Date: Mon, 23 Aug 2004 06:34:15 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Ted,

Use capital E instead of small e.

Simplify[D[(1 + c*E^t)/(1 - c*E^t), t]]
(2*c*E^t)/(-1 + c*E^t)^2

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 


From: Ted Kahn [mailto:tedkahn at mindspring.com]
To: mathgroup at smc.vnet.net

Hello- I am trying to take the derivative of the following function:

(1 + c*e^t)/(1 - c*e^t)

with respect to t.

================
\!\(Simplify[D[\(1 + c\ e\^t\)\/\(1 - c\ e\^t\), t]]\)
============

The answer I get includes an "extra" Log[e] in the numerator. Am I not  
using the program correctly or am I not understanding the answer  
correctly? Other?

thanks, -ted
--