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任意角的三角函数
Author:
GeoGebra Institute of WuXi
GeoGebra
New Resources
柱體建築師
兩位數除以一位數（一）
拼砌四邊形
異分母分數減法
GeoGebra笔记功能体验课件
Discover Resources
sincos
托勒密定理
不規則圖形的周界(intro)
(3D) Tasks: Pyramid, Paper folding & Solid of revolution[20170615]
三角五形
Discover Topics
Trigonometry
Scalene Triangles
Symmetry
Fractions
Calculus