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trigonometry
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black
blackboard
board
chalk
circular
college
cosinus
cotangens
doodle
education
equation
expression
formula
function
functions
geometry
handwriting
handwritten
illustration
indeterminate
indeterminates
lesson
math
mathematic
mathematical
mathematics
maths
school
science
scribble
scribbling
sinus
tangens
theory
trigonometric
trigonometry
university
variable
variables
vector
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