You should design a way of doing algebra calculus on a computer
 

Seems to me that there is no easy way of entering calculus style equations
into Excel and I just think it would be such a cool tool for students and
pure mathematicians who want to show all their working.

Must be possible to devise a way of entering data above and below a dividing
line using some front end tool, and to quickly use Greek characters without
fussing over the insert tool.

Also likely to be a cool add-on for structural engineers who use algebra
notation. They work in offices too!

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