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餘弦定理修正項及風車證明

Author:薛鈞聰

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圓的基本性質
圓的切線方程
直線的斜率：水平變化 & 鉛垂變化
第八周作业3
正方形雪花图案

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CAS View
圆的面积 - 排列组合法
Solid geometry
sinx
廣義角的副本

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