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2020東大理系５
Author:
Saito Koichi
GeoGebra
New Resources
円の伸開線
standingwave
standingwave-reflection-free
正１７角形 作図 regular 17-gon 2
アステロイド
Discover Resources
軌跡2
等距離共役点と二次曲線
分数不等式（符号を考える）自由設定
半球回転
包絡線（関西大2000）
Discover Topics
Optimization Problems
Combinatorics
Tangent Line or Tangent
Kite
Polygons