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hara tomoki
GeoGebra
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standingwave-reflection-free
サイクロイド
カージオイド
円の伸開線
直線の軌跡
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What is blue curve? No.1
難問３（直角三角形）
内接・傍接楕円に接する楕円は？
体3_152_ord2
天動説 Ptolemaic theory
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Optimization Problems
Functions
Statistical Characteristics
Rational Numbers
Exponential Functions