/usr/lib/open-axiom/input/sininv.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 | -- @(#)sininv.input 1.1 89/09/07 20:55:20
draw(sin inv x,x = -1.03..3)
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