The only thing you need to take into account is that the buttons to open the configuration menu, resize, rotate or close the app are a bit hidden: you'll need to hove your mouse on the calculator's corners in order to see them. Alright, you can only configure one currency exchange at a time and you have to enter the rate manually, but that's already more than the Windows Calculator can do. Finally, CrossGL Surface Calculator includes some extra settings that let you customize its transparency, digit style and some other details. Advanced Option Calculator allows you to find option combinations having positive Mathematical Expectation.
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