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单位圆画三角函数图像

Author:梁航宇

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【案例】2013年安徽高考15题
多邊形的面積
垂直線的斜率
漂亮的摇摆曲线
圓的切線方程

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花瓶
分數乘法_李樂雯
工具：PlaneString
以 Unit Circle 了解 Sine 的正/負的副本
椭圆滚动

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Coordinates
Geometry
Hypothesis Testing
Inequalities
Parametric Curves

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