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MathGroup Archive 2001

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RE: Simple indefinite integral disagrees with table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28657] RE: [mg28647] Simple indefinite integral disagrees with table
  • From: "Higinio Ramos" <higra at gugu.usal.es>
  • Date: Sat, 5 May 2001 04:00:42 -0400 (EDT)
  • References: <200105040423.AAA22633@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

----- Original Message -----
From: Mitch Berkson <berkson at home.com>
To: mathgroup at smc.vnet.net
Subject: [mg28657] [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
>
You must put Cos[aa xx] instead of Cos( aa xx) etc.,etc.
In[77]:=
Integrate[xx Cos [aa xx], xx]
Out[77]=
\!\(Cos[aa\ xx]\/aa\^2 + \(xx\ Sin[aa\ xx]\)\/aa\)



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