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Magnitude of cosine
Author:
Chan Suet Kwan
GeoGebra
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多邊形的面積
斜率的值
圓的基本性質
科氏力 (Coriolis Force)
直線的斜率：水平變化 & 鉛垂變化
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根據百分率找數量（一）: 例3
外心
angles in the same segment
ANG_ FIRST_GGB
椭圆中的对称斜率为定值问题20190917