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$Complex math formulas on whiteboard. Mathematics and science with economics concept. Real equations, symbols handwritten by a professional.$

$Hands of math teacher circling variable in formula on whiteboard with red highlighter when explaining topic to students$

$Engineer writing formulas about noise reduction in buildings structures - noise pollution concept with binary code\$

$Complex math learning and formula on a chalkboard. i equals square root of negative 1. Handwritten on chalkboard$

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