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円（おうぎ形）の面積
Author:
斎藤 幸弘
,
hase3desu
Topic:
Circle
GeoGebra
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二次曲線と離心率
sine-wave
平均変化率
standingwave-reflection
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GeoGebraTube
バーゼル問題
Big clock!
外心
無限等比級数の応用
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Differential Calculus
Random Variables
Trigonometry
Expected Value
Stochastic Process or Random Process