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30度直角三角形
Author:
郭勇
GeoGebra
New Resources
讀磅
圓的切線方程
【案例】圆柱体内放置一个大球六个小球
漂亮的摇摆曲线
兩位數除以一位數（一）
Discover Resources
動態角=30
Graph of Cosine Function 餘弦方程圖像
反演 (Inversion)的副本
三角函数诱导公式的副本
F4_Ch9.1 任意角的三角比
Discover Topics
Parabola
Terms
Ellipse
Real Numbers
Hypergeometric Distribution