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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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standingwave-reflection-fixed
standingwave-reflection-free
standingwave-plus
対数螺旋
正17角形 作図 regular 17-gon 2
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2次関数の考察
入射角・反射角2
交点に浮かぶ白い円
直極点とデルトイド
立方体の切り口決定法(非同一平面の3点)
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Parametric Curves
Coordinates
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Sphere
Hyperbola