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圆锥曲线定义的拓展（卡西尼卵形线）
Author:
梁航宇
GeoGebra
New Resources
龙形曲线-分形龙
探究三角形的全等條件
第八周作业3
折扣
斜率的值
Discover Resources
以 Unit Circle 了解 Sine 的正/負
弦心距垂直平分弦
ghseh 二次函數描點法上下平移-2
test
圓冪：到兩點的內積
Discover Topics
Distributions
Conic Sections
Cylinder
Linear Equations
Surface