ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Mon, 12 Jan 2015 05:52:24 -0600Derivative of a functionhttp://ask.sagemath.org/question/25495/derivative-of-a-function/ Hi, I've got this two functions:
psi=function('psi',t)
psi_d=function('psi_d',t)
psi=(sin(delta(t))*v(t))/(l*cos(delta(t)))
psi_d=diff(psi)
but it says *No differentiation variable specified* how can I derivate psi? Please someone help me it's driving me crazy since yesterday!
Thank you very muchSilviaMon, 12 Jan 2015 05:52:24 -0600http://ask.sagemath.org/question/25495/