/usr/lib/pd/extra/zexy/pol2cart.pd is in pd-zexy 2.2.5-2.
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 23 24 25 26 27 28 29 30 31 32 33 34 35 | #N canvas 437 75 457 368 10;
#X obj 259 82 inlet z;
#X text 295 169 z=z;
#X obj 259 331 outlet z;
#X obj 99 125 unpack 0 0 0;
#X text 294 141 x=r*cos(phi);
#X text 295 156 y=r*sin(phi);
#X obj 99 82 inlet r;
#X obj 179 82 inlet phi;
#X obj 82 331 outlet x;
#X obj 179 331 outlet y;
#X obj 138 160 t f f;
#X obj 138 184 cos;
#X obj 168 184 sin;
#X obj 82 201 t f f;
#X obj 82 237 * 1;
#X obj 112 236 * 0;
#X text 63 26 convert polar to cartesian coordinates;
#X obj 99 105 pack \$1 \$2 \$3;
#X text 341 8 part of zexy;
#X connect 0 0 17 2;
#X connect 3 0 13 0;
#X connect 3 1 10 0;
#X connect 3 2 2 0;
#X connect 6 0 17 0;
#X connect 7 0 17 1;
#X connect 10 0 11 0;
#X connect 10 1 12 0;
#X connect 11 0 14 1;
#X connect 12 0 15 1;
#X connect 13 0 14 0;
#X connect 13 1 15 0;
#X connect 14 0 8 0;
#X connect 15 0 9 0;
#X connect 17 0 3 0;
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