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Blackboard with formulas written on it. Mixed media
Related tags:
- trigonometry
- math formula
- equation
- math
- math background
- algebra
- formula
- chalk drawing
- blackboard
- school board
- chalk
- writing board
- classroom board
- school blackboard
- classroom blackboard
- classroom
- school texture
- students classroom
- ink pen
- education background
- knowledge background
- school classroom
- classroom background
- school education
- education
- physics background
- knowledge
- study background
- school sign
- pen
- school drawing
- school background
- study
- chalk background
- pen writing
