mathematics formulas set hand drawn math geometric and calculations chalkboard school chalk gray board |
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| navigate by keyword : geometry math mathematics formula chalkboard chalk education school sketch doodle equation handwritten student algebra hand drawn geometric trigonometry 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 black |
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| Mathematics formulas set. Hand drawn math geometric formulas and calculations on chalkboard. School gray board with chalk freehand sketch symbols. Education concept. Isolated vector illustration |
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