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三角函數定義
Author:
陳柄何
Topic:
Trigonometric Functions
GeoGebra
New Resources
折扣
龙形曲线-分形龙
中华人民共和国国旗
百分數及其應用
平行線的判定
Discover Resources
三角形重心(相關說明)
rotational symmetry_2
找中點軌跡
GGB2
（三）观察物体
Discover Topics
Functions
Rotation
Algebra
Arithmetic
Ellipse