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单位圆与正弦函数
Author:
许亚平
Topic:
Trigonometric Functions
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
異分母分數減法
球体的体积推导（优化版）
找出對稱軸
畫出對稱圖形
Discover Resources
最短
mooc第四讲椭圆反射
shuangquxian
動態幾何錯覺
橢圓(上下型)標準式
Discover Topics
Area
Calculus
Arithmetic Mean
Scalene Triangles
Conic Sections