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Re: Simple indefinite integral disagrees with table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28652] Re: [mg28647] Simple indefinite integral disagrees with table
  • From: "Hugh Philipp" <hph at com.dtu.dk>
  • Date: Sat, 5 May 2001 04:00:39 -0400 (EDT)
  • References: <200105040423.AAA22633@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Following Mathematica syntax, the answer it gave was correct.
What you entered was equivalent to asking for the integral w.r.t. xx of:

xx^2 aa Cos

Where aa and Cos are constants.  I hope the CRC tables say
that the indefinite integral of this is:

(1/3) (xx^3) aa Cos

:-)

Try:

Integrate[xx Cos[aa xx],xx]


-Hugh

----- Original Message -----
From: "Mitch Berkson" <berkson at home.com>
To: mathgroup at smc.vnet.net
Subject: [mg28652] [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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