This expression evaluator processes complex expressions like -ln(1+2) * 3% + sin(4 5/6)^7 and allows exact rational values like 2 1/3 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 font, button size. Show/hide buttons. Always-on-top mode. Swap period/comma, group digits. Help file.
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