How to convert formula to string

Hi, I would like to put at a side of each formula cell its string representation. For example, suppose cell B1 contains the value of ‘=A1+A2’, whatever it is. I would like to have on B2 the string ‘=A1+A2’. If i change the forumula in B1 then the string in B2 should change automatically.
It would be great if there was a formula to do that so I could check all calculations faster and also in printed documents.

FORMULA

yes, exactly what i needed. thank you !