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Author:
Kojiro Shojima, Ph.D.
GeoGebra
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フーリエ級数展開
standingwave-reflection-free
standingwave-reflection-fixed
カージオイド
等積変形2
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数Ⅱ 三角関数（a torigonometric function）
オイラーの公式と回転
三平方
指数関数授業(20181209)
円周角定理の逆
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Upper and Lower Sum or Riemann Sum
Complex Numbers
Ratios
Dilation
Combinatorics