Origin for each line in src/example01.red from check-in c1ddb4c814:
c1ddb4c814 2021-03-01 jeff@gridfini: a:=sin (x); c1ddb4c814 2021-03-01 jeff@gridfini: b:=cos (x); c1ddb4c814 2021-03-01 jeff@gridfini: c:=a^2+b^2; c1ddb4c814 2021-03-01 jeff@gridfini: d:=a/b; c1ddb4c814 2021-03-01 jeff@gridfini: f:=tan (x)-d; c1ddb4c814 2021-03-01 jeff@gridfini: trigsimp c; c1ddb4c814 2021-03-01 jeff@gridfini: trigsimp f; c1ddb4c814 2021-03-01 jeff@gridfini: end;