Imagemagick

showcolor() { display -size 300x300 xc:"#${1}"; }

showcolor fba9c3 &

Perform integration in Python:

from sympy import sin, cos, tan, exp, log, integrate
from sympy.integrals.manualintegrate import manualintegrate
from sympy.abc import x
manualintegrate(1/(1+x*x), x)