---------- Forwarded message ----------
From: John C Frain <frainj at gmail.com>
Date: 2009/5/23
Subject: Re: [Maxima] integrate 1/x
To: Pere Castellv? <pcastellvi at gmail.com>
If x<0
log(x) = i * pi + log(-x)
differentiate both sides to get
d log(x)/dx = dlog(-x)/ dx = 1/(-x) ?* (-1) = 1/x
Best Regards
John
2009/5/23 Pere Castellv? <pcastellvi at gmail.com>:
> Hi!
>
> why don't Maxima gives log(abs(x))?
>
> (%i49) integrate(1/x,x);
> (%o49) log(x)
>
> Best regards
>
> Pere
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--
John C Frain
Economics Department
Trinity College Dublin
Dublin 2
Ireland
www.tcd.ie/Economics/staff/frainj/home.html
mailto:frainj at tcd.ie
mailto:frainj at gmail.com
--
John C Frain
Economics Department
Trinity College Dublin
Dublin 2
Ireland
www.tcd.ie/Economics/staff/frainj/home.html
mailto:frainj at tcd.ie
mailto:frainj at gmail.com