/usr/lib/open-axiom/input/cycloid.input is in open-axiom-test 1.5.0~svn3056+ds-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | -- @(#)cycloid1.input 1.1 89/09/07 20:54:46
draw(curve(t - sin t,1 - cos t),t = -5..5)
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