/usr/share/doc/basic256/examples/trig.kbs is in basic256 0.9.6.69a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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fastgraphics
for x = 1 to 4 * 3.14159 step 0.05
y = sin(x)
plot int(20*x), 150 + int(30*y)
next x
refresh
for x = 1 to 4 * 3.14159 step 0.05
y = cos(x)
plot int(20*x), 150 + int(30*y)
next x
refresh
for x = 1 to 4 * 3.14159 step 0.01
y = tan(x)
plot int(20*x), 150 + int(30*y)
next x
refresh
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