algebra
background
blackboard
board
caucasian
chalk
chalkboard
cheerful
class
classroom
college
complex
cos
drawing
education
equation
exam
female
formula
girl
green
high
intelligent
knowledge
learn
lecture
lesson
math
mathematical
mathematics
people
person
portrait
pretty
school
science
sin
student
study
teach
teacher
theory
tutor
university
white
woman
write
writing
young
定額
female teacher writing math formulas, cos and sin. education conceptの素材 [FY310198109981]
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