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余弦定理

Author:保浦良太

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接点の作る円は内接円
sine-wave
standingwave-reflection-free
直線の軌跡
目で見る立方体の2等分

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内心（図形の性質）
傍心三角形の等角等距共役点
シッソイドの法線の包絡線
フィボナッチ数の作り方
作図の楽しさ（3円相似のまとめ）

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Cuboid
Hypothesis Testing
Rectangle
Parametric Curves
Pythagoras or Pythagorean Theorem

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