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和角公式tan(圖解)
Author:
陳柄何
GeoGebra
New Resources
画直线等分三角形的面积
漂亮的摇摆曲线
第八周作业
三位數除以一位數（二）
直線的斜率
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二維碰撞
曲柄搖桿接雙搖桿
正方體組合
some circles
对角线互相垂直的四边形，证倍分关系的副本
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Random Experiments
Frequency Distribution
Differential Equation
Geometric Transformations
Tangent Function