/usr/share/kde4/apps/libanalitza/plots/basic_curves.plots is in analitza-common 4:4.14.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | sinus := x->sin x
something := x*x+y*y=7.9
plane1 := (x, y, z)->(x+y+z)-1
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