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Hello BP

One of the difficulties in the students when they start arithmetic is the putting of parentheses in linear notation, and to identify the beginning and end of parentheses, some program code editors, by marking a parenthesis highlight or bold or look for the pair of associated parentheses, this is a good idea to incorporate in the display of expressions.

a simple example
((5/(2*x))*x) = (((x+4)/(6*x))*x)

another idea is to show alternative parentheses (UNICODE) only at the time of editing
〔〕〖〗〘 〙❨ ❩ ❪ ❫ ❲ ❳ ❴ ❵

There is already parenthesis match inside Xcas, put the cursor before or after a parenthesis (move slowly right or left if you don't see a green region or the delimiter in red).

Thanks
ok in the online version