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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: [mg28654] Re: Simple indefinite integral disagrees with table
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 5 May 2001 04:00:40 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9ctb6k$m4h@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

function arguments enclosed in [] not in () and you actual calculate

Integrate[aa*x^2*Cos,xx]

instead of

In[]:=Integrate[xx Cos [aa xx], xx]

Out[]=Cos[aa*xx]/aa^2 + (xx*Sin[aa*xx])/aa

Regards
  Jens

Mitch Berkson wrote:
> 
> 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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