       Re: Simply derivative question, Math 5.

• To: mathgroup at smc.vnet.net
• Subject: [mg50251] Re: [mg50240] Simply derivative question, Math 5.
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Mon, 23 Aug 2004 06:34:13 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```The input form of the exponential constant is E not e

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

(2*c*e^t*Log[e])/(c*e^t - 1)^2

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

(2*c*E^t)/(c*E^t - 1)^2

Bob Hanlon

>
> From: "Ted Kahn" <tedkahn at mindspring.com>
To: mathgroup at smc.vnet.net
> Date: 2004/08/22 Sun AM 12:19:51 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg50251] [mg50240] Simply derivative question, Math 5.
>
> 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
> --
>
>

```

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