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くの字の角の秘密

Author:福永義行

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正１７角形　作図　regular 17-gon 2
standingwave-reflection-free
standingwave-reflection-fixed
standingwave
二次曲線と離心率

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立方体の頂点と二項係数
中学3年円周角と中心角
a±b√2を根とする方程式
位相差
sin関数のグラフと円の関係

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Complex Numbers
Inequalities
Differential Equation
Parabola
Area

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