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Author:
s.arikawa
GeoGebra
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sine-wave
standingwave-reflection-free
フーリエ級数展開
正１７角形 作図 regular 17-gon 2
二次曲線と離心率
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動点P
Ex_69
三角比の拡張
一次関数（2動点と三角形の面積）
三角形の内心
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Indefinite Integral
Optimization Problems
Rational Numbers
Square
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