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Re: Simple indefinite integral disagrees with table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28672] Re: Simple indefinite integral disagrees with table
  • From: "Paul Lutus" <nospam at nosite.com>
  • Date: Tue, 8 May 2001 02:51:10 -0400 (EDT)
  • References: <9ctb6k$m4h@smc.vnet.net> <7%4J6.9909$I11.47858@ralph.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Planet Internet Nieuws" <A.BinTalal at its.tudelft.nl> wrote in message
news:7%4J6.9909$I11.47858 at ralph.vnet.net...
> try the following :
>
> (1/3) aa Cos xx^3==(1/aa^2) Cos (aa xx) + (xx/aa) Sin (aa xx)//Equal
>
> the answer will be True, Mathematica just choose a solution with less
terms

No, as a matter of fact, the original poster wanted trigonometric functions,
which your solution doesn't include.

The actual Mathematica syntax must be:

Integrate[x Cos[a x], x]

With the result:

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

--
Paul Lutus
www.arachnoid.com





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