* Ronald Modesitt <rmodesi at msn.com> [2008-05-28 13:26:27 -0600]:
> All,
>
> I have the function
>
> (%i1) y(x):=(x^2-1)^10*(x^2+1)^15;
>
> (%o1) y(x):=(x^2-1)^10*(x^2+1)^15
>
>
>
> (%i2) diff(y(x),x);
>
> (%o2) 20*x*(x^2-1)^9*(x^2+1)^15+30*x*(x^2-1)^10*(x^2+1)^14
>
>
>
> manually this simplifies to
>
> 10*x*(5*x^2-1)*(x^2-1)^9*(x^2+1)^14
>
>
>
> however factor(%) yields
>
> (%i3) factor(%);
>
> (%o3) 10*(x-1)^9*x*(x+1)^9*(x^2+1)^14*(5*x^2-1)
>
>
>
> What am I not seeing or doing incorrectly?
>
(x^2-1)^9 = (x-1)^9 * (x+1)^9 , all the other terms are identical.
Milan
>
>
> Thanks
>
> Ron
>
>
>
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