/usr/lib/pd/extra/purepd/sinh.pd is in pd-purepd 0.1.1-1.
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 20 21 22 | #N canvas 0 0 450 300 10;
#X obj 88 37 inlet;
#X obj 88 87 t a a;
#X obj 88 223 outlet;
#X obj 120 116 * -1;
#X obj 120 136 exp;
#X obj 88 136 exp;
#X obj 88 174 -;
#X obj 88 199 * 0.5;
#X text 313 133 2;
#X text 272 105 exp(x) - exp(-x);
#X text 223 117 sinh = ----------------;
#X obj 88 64 f \$1;
#X connect 0 0 11 0;
#X connect 1 0 5 0;
#X connect 1 1 3 0;
#X connect 3 0 4 0;
#X connect 4 0 6 1;
#X connect 5 0 6 0;
#X connect 6 0 7 0;
#X connect 7 0 2 0;
#X connect 11 0 1 0;
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