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海螺
Author:
赵林
GeoGebra
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盈利與虧蝕
比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
三角函数 的副本
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練習－由一元二次方程判別根的數目
角椎體積
cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
椭圆的定义
函数求导
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Power Functions
Surface
Differential Calculus
Confidence Interval
Indefinite Integral