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