What about something like:
sage: t = var('t')
sage: Omega = function('Omega')
sage: quanti = Omega(t)*cos(t) + diff(Omega(t), t)
sage: quanti
Omega(t)*cos(t) + diff(Omega(t), t)
sage: Omega0 = var('Omega0')
sage: Omega_const(t) = Omega0
sage: quanti.substitute_function(Omega, Omega_const)
Omega0*c
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V
On Friday, September 1, 2017 at 10:32:17 PM UTC+1, Назар Зибилюк wrote:
at the bottom of the log one sees
ImportError: No module named psutil
Also, it appears to be Sage 7.6 on Fedora 26.
First, try
sudo dnf install python2-psutil
--- I'm not sure whether Sage uses system's Python2, or
