Toss your hand-held calculator and forget about the Windows built-in offering. In a single step, this expression evaluator processes complex expressions like -ln(1+2) * 3% + sin(4 56)^7 and allows exact rational values like 2 13 instead of 2.3333... Compact single-line mode or flexible multi-line editor to edit past work, recalculate, cut and paste on the tape, save to file, restore. Select your favorite font and button size, show/hide buttons, use non-decimal number bases: binary, octal, hexadecimal.
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Alright, cool.