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Re: Simple indefinite integral disagrees with table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28651] Re: Simple indefinite integral disagrees with table
  • From: "Paul Lutus" <nospam at nosite.com>
  • Date: Sat, 5 May 2001 04:00:38 -0400 (EDT)
  • References: <9ctb6k$m4h@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Mitch Berkson" <berkson at home.com> wrote in message
news:9ctb6k$m4h at smc.vnet.net...
> 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.

You need to take a few minutes to read Mathematica's instructions. Try
entering it this way:

Integrate[x Cos[a x], x]

result: Cos[a x] / a^2 + x Sin[a x] / a

This result agrees with the CRC Handbook of Chemistry and Physics, which I
assume is your reference.

--
Paul Lutus
www.arachnoid.com





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