# [Maxima] integrate(sin(x)*cos(x),x)

ddimuc at sbcglobal.net ddimuc at sbcglobal.net
Tue May 15 21:08:35 CDT 2007

```Doug Stewart wrote:
> I was showing my students how to use Maxima to check their homework.
>
> When I got to this part of the example I got a surprise.
> integrate(sin(x)*cos(x),x)
>
> maxima said it was  -cos^2(x)/2  and my book said it was sin^2(x)/2 so I
> looked it up in shaums formula book
> and it said sin^2(x)/2.
>
> So I then plotted up a graph in Octave and was convinced that Maxima is
> wrong.
>
> I then submitted a bug report and someone replied and told me that I
> should take a course in basic calculus.
>
>
> "
>
> Date: 2007-05-15 17:21
> Sender: nobody
> Logged In: NO
>
> Of course it´s NOT wrong!
>
> Differentiate the result and see yourself ...
>
> (and BTW, take a course in elementary calculus ;-))"
>
> What do the experts here say?????
>
> Doug Stewart B.E.Sc P.Eng.
>
>
>
>
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> Maxima at math.utexas.edu
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>
>
Why must people seem to feel the need to be disrespectful?  Big f*^&ing
deal, the guy forgot that cos and sin are indeed related.  Does that
mean we have the right to react negatively?!  Don't bother responding if
your intentions are to justify disrespectful behaviors.  Here's one
right back at ya: If you don't understand a word I'm saying, go back to
the first grade.  (Did you get insulted?  Do you feel stupid now?  I
hope you did/do.)

```