Re: Simple indefinite integral disagrees with table

*To*: mathgroup at smc.vnet.net*Subject*: [mg28663] Re: [mg28647] Simple indefinite integral disagrees with table*From*: Matt.Johnson at autolivasp.com*Date*: Sat, 5 May 2001 04:00:47 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Mitch- Use the correct mathematica notation, it agrees with the CRC answer: In[6]:= mitchIntegral = Integrate[xx Cos[aa xx], xx] Out[6]= \!\(Cos[aa\ xx]\/aa\^2 + \(xx\ Sin[aa\ xx]\)\/aa\) In[7]:= crcAnswer = (1/aa^2) Cos[aa xx] + (xx/aa) Sin[aa xx]; mitchIntegral == crcAnswer Out[8]= True Your input uses Cos as a variable, not a call to the cosine function. Read the book, learn about the brackets.... -matt "Mitch Berkson" <berkson at home.com> on 05/03/2001 10:23:11 PM cc: Subject: [mg28663] [mg28647] Simple indefinite integral disagrees with table 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 ************************************************************************************************************************************** All Autoliv e-mails remain Company property and shall be used for business-related purposes only. Do not forward any material contained within this e-mail without prior, written permission from the author's manager. Autoliv disclaims all responsibility and accepts no liability (including negligence) for the consequences for any person acting, or refraining from acting on this information prior to the receipt by those persons of subsequent written confirmation. **************************************************************************************************************************************