/usr/lib/pd/extra/iemmatrix/mtx_cos-help.pd is in pd-iemmatrix 0.2-1.
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 9 10 11 12 13 14 15 16 17 18 19 | #N canvas 128 118 680 254 10;
#X text 458 17 updated for;
#X obj 546 17 iemmatrix 0.2;
#X obj 595 43 matrix;
#X text 465 42 see also help for;
#X obj 595 63 cos;
#X obj 48 164 mtx_cos;
#X obj 48 192 mtx_print cos;
#X obj 48 131 t a a;
#X obj 91 132 mtx_print org;
#X text 136 10 cosine of matrix elements;
#X text 45 42 compute the cosine of each element of a matrix;
#X obj 48 100 mtx 2 2;
#X msg 48 80 0 3.14159 1 90;
#X connect 5 0 6 0;
#X connect 7 0 5 0;
#X connect 7 1 8 0;
#X connect 11 0 7 0;
#X connect 12 0 11 0;
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