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过圆上一点作切线，三步
Author:
u.jianwang
New Resources
正弦函数自变量的几何显示
动点练习6
幂函数的副本
地球5
三角函數出題器2.0
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分數減法
最簡分數
相似三角計算
拋物線：切線與弦中點
perpendicular line 25-9-2018
Discover Topics
Circle
Sequences and Series
Optimization Problems
Logic
Constructions
