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三角比の拡張
Author:
sd
GeoGebra
New Resources
sine-wave
standingwave
目で見る立方体の2等分
正１７角形 作図 regular 17-gon 2
standingwave-plus
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回転移動２
三平方の定理 証明９
Copy of 点の存在範囲（0≤c≤2）
鈍角三角形の極円
試作1
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Coordinates
Area
Angles
Real Numbers
Cosine