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教学素材：正切函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
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圓的基本性質
直線的斜率：水平變化 & 鉛垂變化
异形操场
三角函数 的副本
科赫雪花
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色彩視覺藝術：奇幻光圈
線性組合
二次函数
Angle of elevation and Angle of depression(仰角和俯角)
畢氏定理的副本
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Means
Cone
Polygons
Vectors 3D (Three-Dimensional)
Parabola