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su black 25（1）
Author:
su
GeoGebra
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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
三角函数 的副本
第八周作业
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排列
quadrilaterals 1
Locus of a vertex of equilateral triangle
圆与它的外切圆
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Surface
Sphere
Arithmetic
Algebra
Cube