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ΣΣk=1+3+6+
Author:
Bunryu Kamimura
∑k(k-1)=(n-1)n(n+1)/3を使う。
GeoGebra
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サイクロイド
standingwave
sine-wave
二次曲線と離心率
目で見る立方体の2等分
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Euclid's proof diagram for the Pythagorean theorem.
2次曲面の分類
x=cos3t,y=sin4t
通術 6円
(x,y)→(x+y,xy)
Discover Topics
Definite Integral
General Quadrilateral
Coordinates
Straight Lines
Intersection