adult
algebra
background
blackboard
board
calculate
chalkboard
college
concept
drawing
education
equation
equations
exam
examination
formula
formulas
genius
gray background
grey background
guy
hand
high
knowledge
learn
lecture
lesson
man
math
mathematical
mathematics
maths
physics
researcher
scholar
school
science
scientist
solution
stress
student
students
study
symbol
teach
teacher
theory
trigonometry
university
writing
定額
Man scientist or student working with various high school maths and science formulas.の素材 [FY31081409180]
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