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Author:
大川哲史
GeoGebra
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サイクロイド
二次曲線と離心率
目で見る立方体の2等分
接点の作る円は内接円
standingwave-reflection
Discover Resources
恒等式,
楕円の極線
（使用）中二等積変形 p148
暗算練習
三角関数改
Discover Topics
Percentages
Probability
Parametric Curves
Frequency Distribution
Pythagoras or Pythagorean Theorem