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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: [mg28659] Re: [mg28647] Simple indefinite integral disagrees with table
  • From: BobHanlon at aol.com
  • Date: Sat, 5 May 2001 04:00:43 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

You must use square brackets for functions.  Note what happens in what you 
entered if the xx is replaced by bb.

bb Cos (aa bb)

aa*bb^2*Cos

Integrate[xx Cos [aa xx], xx]

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


Bob Hanlon

In a message dated 2001/5/4 12:34:13 AM, berkson at home.com writes:

>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.
>


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