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Re: Simply derivative question, Math 5.

• To: mathgroup at smc.vnet.net
• Subject: [mg50256] Re: Simply derivative question, Math 5.
• From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
• Date: Mon, 23 Aug 2004 06:34:23 -0400 (EDT)
• References: <cg97nq$a7p$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

That's because your e is NOT the base of natural logarithms (which is E).

Steve Luttrell

"Ted Kahn" <tedkahn at mindspring.com> wrote in message
news:cg97nq$a7p$1 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
> -- 
>