/usr/lib/pd/extra/cyclone/acos-help.pd is in pd-cyclone 0.1~alpha55-3.
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 9 10 11 12 13 14 15 16 | #N canvas 1253 344 435 229 10;
#X declare -lib cyclone;
#X text 15 35 Arccosine(x);
#X obj 189 69 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X floatatom 189 145 0 0 0 0 - - -;
#X floatatom 84 145 0 0 0 0 - - -;
#X floatatom 84 69 0 0 0 0 - - -;
#X text 259 96 optional arg;
#X obj 290 12 import cyclone;
#X obj 84 100 acos;
#X obj 189 100 acos 0.5;
#X connect 1 0 8 0;
#X connect 4 0 7 0;
#X connect 7 0 3 0;
#X connect 8 0 2 0;
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