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陳人瑜proof81
Author:
郭亮偉
GeoGebra
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双心四边形
直線的斜率：水平變化 & 鉛垂變化
圓的切線方程
圓的基本性質
盈利與虧蝕
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Quiz on Scientific Notation
a sin(bx+c) +d
如何判斷曲線夠不夠圓
印度魔幻數學平方法
诱导公式四（原点对称关系）
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Median Line
Diagrams
Constructions
Logarithmic Functions
Inequalities