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三角関数の倍角
Author:
Bunryu Kamimura
GeoGebra
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正１７角形 作図 regular 17-gon
正１７角形 作図 regular 17-gon 2
直線の軌跡
円の伸開線
sine-wave
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アポロニウスの円錐曲線論５
９点円の性質
Twofold symmetry
放物線に外接する三角形の性質
三角形の数は？
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Step Functions
Square
Sequences and Series
Straight Lines
Tangent Function