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Author:
林順隆
GeoGebra
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平行線的判定
圓的切線方程
斜率的值
平行線的斜率
直線的斜率：水平變化 & 鉛垂變化
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Measurement & Classification of Angles 角的量度和分類
it's for fun
Quiz on Index Notation 指數記數法：測驗
过圆上一点作切线，三步
最短距離
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Complex Numbers
Parallelogram
Continuity
Derivative
Rational Numbers