HOW to show in A2 the formule used in A1 ?

[Thierry Fracheboud]

Hello,
I want to show in A2 the formule used in A1, but I want that if I change the
formule in A1, the A2 show directly the new formule.
Exemple :
1) I write in A1 : =12*1000+1000 (A1 show just the result of the formule :
13'000)
2) I want that in A2 the formule : " =12*1000+1000" appear, and that if I
change the formule in A1, A2 show directly the new formule.
Thanks for help and copie of answer to : (e-mail address removed)