/usr/lib/open-axiom/input/sinsin2.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
draw(sin(x) * sin(y),x = 20*%pi..22*%pi, y = 20*%pi..22*%pi)