       Re: Integration - another Integer as a result

• To: mathgroup at smc.vnet.net
• Subject: [mg93760] Re: [mg93743] Integration - another Integer as a result
• From: DrMajorBob <btreat1 at austin.rr.com>
• Date: Tue, 25 Nov 2008 07:16:30 -0500 (EST)
• References: <200811241144.GAA16308@smc.vnet.net>

```Two problems:

(1) nPi is not the same as n Pi (similarly for mPi).

(2) the first link shows input and output in TraditionalForm, where Sin is
diplayed as sin. The Mathematica NAME of the function, however, is Sin.

Integrate[2 x Sin[n Pi x/L] Sin[m Pi x/L], x]

(1/(\[Pi]^2))L ((
L Cos[((m - n) \[Pi] x)/L] + (m - n) \[Pi] x Sin[((m - n) \[Pi] x)/
L])/(m - n)^2 - (
L Cos[((m + n) \[Pi] x)/L] + (m + n) \[Pi] x Sin[((m + n) \[Pi] x)/
L])/(m + n)^2)

Bobby

On Mon, 24 Nov 2008 05:44:28 -0600, MikeSw <sowasowa at o2.pl> wrote:

> Hello,
>
> I'm trying to calculate an integer using Mathematica, but instead of
> getting a "normal" result I get another Integer. The algorithm available
> on Wolfram website does this calculation with no problem:
>
> http://img156.imageshack.us/my.php?image=cakaqt6.jpg
>
> but Mathematica gives this:
>
> http://img156.imageshack.us/my.php?image=cakamtkmvk9.jpg
>
> I guess there is something wrong with the input?
>

--
DrMajorBob at longhorns.com

```

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