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四角形内部の四角形（中点連結定理）
Author:
Shinya Yokobayashi
GeoGebra
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二次曲線と離心率
アステロイド
コイン投げと樹形図
対数螺旋
斜めドップラー
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sphere_cube
チェバの定理２
sec cosec cot functions
面をたたむ・転がす
GHS3415
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Functions
Constructions
Integral Calculus
Random Experiments
Difference and Slope