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特殊角三角函数值
Author:
GeoGebra Institute of WuXi
GeoGebra
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平行線的斜率
双心四边形
直線的斜率：水平變化 & 鉛垂變化
空间中两直线的位置关系
圓的切線方程
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S5 2D Trigonometry
圓錐體內切球
Similar triangles inscribed iteration
信心水準與信賴區間的副本
Tangent of circle
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Congruence
Linear Functions
Volume
Cylinder
Similar Triangles