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MathGroup Archive 2001

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Ynt: Simple indefinite integral disagrees with table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28653] Ynt: [mg28647] Simple indefinite integral disagrees with table
  • From: Ugur <yahsi at marun.edu.tr>
  • Date: Sat, 5 May 2001 04:00:39 -0400 (EDT)
  • References: <200105040423.AAA22633@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

When you type the build-in functions, you have to put variables in brackets.
You have to write  Cos[aa xx] instead of Cos(aa xx);
Integrate[xx Cos [aa xx], xx]
Result would be the same as your CRC table.
Ugur



----- Original Message -----
From: Mitch Berkson <berkson at home.com>
To: mathgroup at smc.vnet.net
Subject: [mg28653] [mg28647] Simple indefinite integral disagrees with table


> The Mathematica solution to the indefinite integral below doesn't agree
with
> that found in my CRC tables.
>
> Integrate[xx Cos (aa xx), xx]
> = (1/3) aa Cos xx^3
>
> The CRC table gives: (1/aa^2) Cos (aa xx) + (xx/aa) Sin (aa xx)
>
> The Mathematica solution doesn't look right.  Thanks for any help.
>
> Mitch Berkson
>



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