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杯子反射光線(包絡)
Author:
陳柄何
Topic:
Curve Sketching
GeoGebra
New Resources
判斷球體
異分母分數減法
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
Discover Resources
Newton
指數圖形的變化
example 1_sun
三角形的垂心
基础知识
Discover Topics
Cosine
Dilation
LCM and GCD
General Quadrilateral
Line Segment