mathematics formulas set hand drawn math trigonometry and calculations chalkboard school board |
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| navigate by keyword : math mathematics formula chalkboard chalk trigonometry education school sketch doodle equation handwritten geometry student algebra hand drawn geometric lesson science calculate board vector illustration symbol number sign numbers blackboard concept text study drawing icon design fraction percent proportions pythagoras theorem triangle exponent parallelogram trapezoid sine cosines truncated cone green |
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| Mathematics formulas set. Hand drawn math trigonometry formulas and calculations on chalkboard. School green board with chalk freehand sketch symbols. Education concept. Isolated vector illustration |
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