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三角関数（正弦、余弦）
Author:
yukumura yasunori
Topic:
Trigonometric Functions
GeoGebra
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正１７角形 作図 regular 17-gon 2
sine-wave
二次曲線と離心率
円の伸開線
対数螺旋
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Ex_82
球回転体
tyokusenn
おうぎ形
目で見る立方体の2等分
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Combinatorics
Probability
Continuity
Conic Sections