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鈍角の三角比（定義）

Author:Tetsuya Akazawa

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フーリエ級数展開
６章⑥三角柱の展開図
sine-wave
接点の作る円は内接円
対数螺旋

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ダイヤモンド格子とK4格子
中点多角形の重心は収束する
等積変形　p139　例題1
vegeta
sin 関数

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Multiplication
Reflection
Statistical Characteristics
Ellipse
Curve Sketching

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