/usr/share/doc/mathomatic/tests/fraction.in is in mathomatic 16.0.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | ; Algebraic fractions tutorial.
; This Mathomatic input shows how "simplify fraction" and "unfactor fraction" work.
1/x+1/y+1/z
fraction ; Convert expressions with algebraic fractions into a single fraction.
simplify
simplify fraction ; does the same as the above fraction command, but simplifies more.
unfactor ; Expand the products of sums.
unfactor fraction ; Fully expand algebraic fractions by also expanding division of sums.
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