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sage: v1 = line([[-1,-1],[-1,1]], rgbcolor=(1/4,1/8,3/4))
sage: v2 = line([[1,-1],[1,1]], rgbcolor=(1/4,1/8,3/4))
sage: L = [line([[-1,-1+2*i/50],[1,sin(3*pi*(-1+2*i/50))]],rgbcolor=(i/50,1-i/50,1/4)) for i in range(51)]
sage: t = text('x -> sin(3*pi*x)', (0.5, -1.15))
sage: show(v1+v2+sum(L)+t)
You can probably copy an paste this into the
SAGE notebook
(or, if you are behind a firewall, try the
proxy SAGE notebook
(Click on "new" on the left corner, make up a name, like
"myplots", and password, like "arecool", and click "add".
Then select "myplots" from the list and
paste the above into a cell. You can include the "sage: " if
you want.)
I thank Rick Kreminski for suggesting this style of function plot.