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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
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第八周作业3
圓的切線方程
直線的斜率：水平變化 & 鉛垂變化
三角函数 的副本
科氏力 (Coriolis Force)
Discover Resources
Simulation of the uniform variable linear motion with GeoGebra
切線性質
扇形面積公式2
test1
「相似三角形」任务1的副本
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Function Graph
Complex Numbers
Fractions
Equilateral Triangles
Conic Sections