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三角函数线
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方程
GeoGebra
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活动三：应用性质
科氏力 (Coriolis Force)
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
双心四边形
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兩數相加
翻轉方塊(雙開)
陳允杰 橢圓反射
Tangent of a Circle 圓的切線
全等三角形
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Sequences and Series
Ellipse
Area
Trigonometric Functions
Cylinder