Richard Fateman writes:
> As is often the case, you get unusual answers when if you
> have not conformed to the expected syntax. Certainly
> cos^3(x) is not the same as (cos(x))^3, nor is
> sin*(2*x) the same as sin(2*x).
>
> Do you mean f1(x):= ( cos(sin(2*x)))^3 ?
>
> RJF
>
>
Hi Richard-
Ok, my bad.
I take back what I said! ;-)
The correct syntax yields the correct answer.
Thanks for pointing this out!
Best regards,
Henry
> synthespian wrote:
> >
> > Hi James-
> >
> > I disagree that Maxima is trustworthy. There are little bugs here
> > and there. More than I have time to report or annotate.
> > I gave up on using it for graphics altogether.
> > I hope for better days.
> >
> > Let me give you another bug, involving differentiation:
> >
> > (C1) f1(x):= (cos^3*(sin*(2*x)));
> > (C2) diff(f1(x),x);
> > This evaluates to the bizarre answer:
> >
> > 2 x cos^3 DEL(sin) + 6 x cos^2 sin DEL(COS) + 2 cos^3 sin DEL(x)
> >
> > The correct answer, by hand and confirme with Maple, is:
> >
> > 6 cos^2(sin(2x))*sin(sin(2x))*cos(2x);
> >
> > Regs,
> >
> > Henry
> > synthespian@uol.com.br
> >
> > James Amundson writes:
> > > Great. Not too long ago, I wrote that none of the bugs found recently in
> > > Maxima resulted in mathematically incorrect answers. Now you have to go
> > > an ruin the streak.
> > >
> > > This bug deserves *careful* consideration.
> > >
> > > Thanks for the report.
> > >
> > > --Jim
> > >
> > >
> > > On Fri, 2002-04-05 at 14:36, C Y wrote:
> > > > I've run into a problem with the Maxima integration ability. I tried
> > > > to integrate 3^log(x), and according to both hand and mathematica
> > > > calculations the answer should be (x*3^log(x))/(1+log(3)). Maxima,
> > > > however, gives 3^(2*log(x))/(2*log(3)). Here is a simple test to show
> > > > the problem:
> > > >
> > > > (C1) c:3^log(x);
> > > >
> > > > LOG(x)
> > > > (D1) 3
> > > > (C2) diff(integrate(c,x),x);
> > > >
> > > > 2 LOG(x)
> > > > 3
> > > > (D2) ---------
> > > > x
> > > >
> > > >
> > > > CY
> > > >
> > > >
> > > > __________________________________________________
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