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平方の和 Σk^2
Author:
Bunryu Kamimura
6個の四角錐の組み合わせの方が分かりやすいが、平面で証明できることが素晴らしい。これをさらに利用して・・・
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錯視7
df = f_x1 dx1 + f_x2 dx2
かけ算の暗算
等角等距離双曲線と三角形の心
Copy of 接
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Expected Value
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