4325.sagews

t = var('t')
p1 = plot(1/t, (t,-5,-0.1))
p2 = plot(1/t, (t,0.1,5))
show(p1+p2, aspect_ratio=1)

x = var('x')
show((x^3-1)/(x^2-1))
plot((x^3-1)/(x^2-1), (x,-4,2))

\newcommand{\Bold}[1]{\mathbf{#1}}\frac{x^{3} - 1}{x^{2} - 1}