The series exists, and has the 1/x term in general, but it is missing the shift by pi/2:
http://www.wolframalpha.com/input/?i=tan%28x%29+series+at+x%3Dpi%2F2 So I think there is a bug. Ondrej On Sat, Jun 7, 2014 at 1:23 PM, Aaron Meurer <asmeu...@gmail.com> wrote: > I think what you're getting is a generalized Lambert series. Notice > that one of the terms is 1/x. > > Aaron Meurer > > On Wed, Jun 4, 2014 at 11:01 AM, su225 <su225co...@gmail.com> wrote: >> Hello. I'm new to sympy and took the tutorial today. But I noticed the >> following error. I'm glad to contribute to this project. >> Where can I get resources to learn more about the sympy? >> >> The following line produces erroneous output. >> In [129]: tan(x).series(x,pi/2,10) >> >> I have attached the screenshot of the output >> >> tan(x) cannot be expanded about pi/2. >> The idea is determining the interval of convergence. If the point specified >> for the expansion is out of this interval then throw an exception telling >> that the power series expansion doesn't exist about that point. >> >> Thanks. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sympy+unsubscr...@googlegroups.com. >> To post to this group, send email to sympy@googlegroups.com. >> Visit this group at http://groups.google.com/group/sympy. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/67a11e70-9e0f-4a8c-8078-66550de884a3%40googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAKgW%3D6%2BoGXHwKGzScS0BGVtaGes_3%3Diy%3DURfd7hdM8oyOhsP-A%40mail.gmail.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADDwiVBcV%3D2%3DcS1pNR9fByAz8v%2BKAtn14JgOL_n%2BOyH9bqPzAA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
