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Topic: integrate problem
Replies: 2   Last Post: Apr 20, 2009 7:11 PM

 Messages: [ Previous | Next ]
 talmanl@mscd.edu Posts: 1,838 Registered: 12/6/04
Re: integrate problem
Posted: Apr 20, 2009 7:10 PM

On Apr 20, 2009, at 3:39 AM, sean_incali@yahoo.com wrote:

> But the following gives the integral itself.
>
> Integrate[1/(s[t] + a), t]

As it should. This isn't a problem with Mathematica---it's a problem

>
>
> If the function that needs to be integrated w.r.t time is 1/(s[t] +
> a), how do I accomplish that?

You don't. At least, you don't without knowing the function s[t].
For example, if s[t] = t, the integral is Log[t + a], while if s[t] =
t^2, the integral is Arctan[t/Sqrt[a]]/Sqrt[a].

--Louis A. Talman
Department of Mathematical & Computer Sciences
Metropolitan State College of Denver

<http://clem.mscd.edu/%7Etalmanl>

Date Subject Author
4/20/09 talmanl@mscd.edu
4/20/09 Andrzej Kozlowski