Thank you very much ! Loïc
Le samedi 28 février 2009 à 02:37 -0800, Rolandb a écrit : > This works: > > f=arccos((1-x^2)/(1+x^2)) > g=f.diff(x) > g.simplify_full() > 2*x/((x^2 + 1)*abs(x)) > > In general: type g. TAB and you will find all kind of handy functions. > > Roland > > On 28 feb, 10:58, Loïc <xl...@free.fr> wrote: > > Hello > > > > Another problem: > > I want the derivative for the function arccos((1-x^2)/(1+x^2)) > > > > I wrote: > > > > f=arccos((1-x^2)/(1+x^2)) > > f.diff(x) > > -(-2*x/(x^2 + 1) - 2*x*(1 - x^2)/(x^2 + 1)^2)/sqrt(1 - (1 - x^2)^2/ > > (x^2 + 1)^2) > > > > The best answer would be: > > 2/(1+x^2)*sign(x) > > > > How can I simplify this expression to get this answer? > > > > Best > > > > Loïc > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
