algebra
alpha
blackboard
board
calculate
calculations
chalk
chalkboard
class
classroom
close
college
cos
doodle
drawing
drawn
education
educational
equation
equations
formula
formulas
green
hand
handwriting
homework
illustration
knowledge
lesson
math
mathematical
mathematics
number
school
science
script
sign
sin
solution
study
symbol
theorem
theory
trigonometry
university
up
white
write
writing
定額
Trigonometric equation written on the chalkboard. School curriculum.の素材 [FY310105387957]
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