Origin for each line in src/example01.red from check-in 5ce5316a33:

5ce5316a33 2021-03-01 jeff@gridfini: a:=sin (x);
5ce5316a33 2021-03-01 jeff@gridfini: b:=cos (x);
5ce5316a33 2021-03-01 jeff@gridfini: c:=a^2+b^2;
5ce5316a33 2021-03-01 jeff@gridfini: d:=a/b;
5ce5316a33 2021-03-01 jeff@gridfini: f:=tan (x)-d;
5ce5316a33 2021-03-01 jeff@gridfini: trigsimp c;
5ce5316a33 2021-03-01 jeff@gridfini: trigsimp f;
5ce5316a33 2021-03-01 jeff@gridfini: end;