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

5ce5316a33 2021-03-01    1: a:=sin (x);
5ce5316a33 2021-03-01    2: b:=cos (x);
5ce5316a33 2021-03-01    3: c:=a^2+b^2;
5ce5316a33 2021-03-01    4: d:=a/b;
5ce5316a33 2021-03-01    5: f:=tan (x)-d;
5ce5316a33 2021-03-01    6: trigsimp c;
5ce5316a33 2021-03-01    7: trigsimp f;
5ce5316a33 2021-03-01    8: end;