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問題１３

Author:kyouko

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standingwave-reflection
二次曲線と離心率
等積変形2
コイン投げと樹形図
目で見る立方体の2等分

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動く長方形
test2
正２０面体（黄金比）
円錐曲線が接線で対称になることの証明
自由端反射

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Circle
Subtraction
Numbers
Stochastic Process or Random Process
Congruence

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