A89: Re: Summation bug???
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A89: Re: Summation bug???
Try putting the |x=2 part at the very end, like so:
E((-1/2)^n*x^(2*n)/n!,n,0,2)|x=2
----- Original Message -----
From: <JayEll64@aol.com>
To: <assembly-89@lists.ticalc.org>
Sent: Monday, September 11, 2000 4:24 PM
Subject: A89: Summation bug???
>
> I seem to be having a bit of trouble with the summation function on the
> TI-89...seems pretty simple, too. Anyway, I typed in
> "E((-1/2)^n*x^(2*n)/n!|x=2,n,0,2)" and it returns "3*2^n*(-1)^n/(n!)" (the
> 'E' is a capitol sigma). However, when I physically replace x with 2 in
the
> expression (and subsequently delete the "|x=2" part), it returns the
correct
> answer of 1. How come there's 'n's in the returned expression of the
first
> entry? Shouldn't the "with" operator ( | ) have replaced all occurences
of x
> in the subexpression with 2?
>
> JayEll
>
>
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