Origin for each line in src/example04.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+b; 5ce5316a33 2021-03-01 4: d:=c^2; 5ce5316a33 2021-03-01 5: % derivative 5ce5316a33 2021-03-01 6: df(d, x); 5ce5316a33 2021-03-01 7: % manual derivative 5ce5316a33 2021-03-01 8: 2*(a+b)*(df(a,x)+df(b,x)); 5ce5316a33 2021-03-01 9: end;