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F2 正三角形の合同 証明問題
Author:
Hisao Yamamoto
GeoGebra
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対数螺旋
standingwave-reflection
standingwave
コイン投げと樹形図
standingwave-plus
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triangle_001
最大値（上に凸）
台形
時計
円周角の定理の逆
フーリエ級数展開
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Calculus
Logic
Constructions
Geometry
Step Functions