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特殊な正接の2倍角の視覚的理解
Author:
holon
GeoGebra
New Resources
standingwave-plus
目で見る立方体の2等分
直線の軌跡
standingwave-reflection
standingwave
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相似の内心と外心
角の二等分線1
asin acos atan functions
発展問題(三平方の定理の利用)
面積の等しい三角形を見つける（等積変形）
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Means
Differential Calculus
Logic
Translation
Integers