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man, wearing, gray, shirt, facing, blackboard, board, school, university, research, teaching

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mathematics, physics, formula, moment of inertia, university, research, teaching, professor, teacher, student, mass moment of inertia

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curve, mathematics, physics, formula, moment of inertia, university, research, teaching, professor, teacher, student

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man, holding, opened, book, sitting, black, chalkboard, background, board, school, university

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