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Derivative of a sum.

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  • Subject: [mg101615] Derivative of a sum.
  • From: "Muntoni Giampaolo" <muntoni.giampa at>
  • Date: Fri, 10 Jul 2009 23:25:59 -0400 (EDT)

In order to resolve a problem I have found the question of derivating  the 
expression e^(-x)*Sum(in i)(x^n/n!, (i,0,n));the solution is easy and is 
But using language of Mathematica I have obteined a different result with a 
ricorse of Gamma function...also recurring to the option of manipulate, 
changing the value of  integer n.
I would want to obtain the exact result with language of Mathematica and 
Manipulate respect to n and also plotting the original function and its 
derivative.(with manipulate)
Thanks for aids

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