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手表内部秒针结构示意
Author:
huyubo1125
GeoGebra
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垂直線的斜率
三角函数 的副本
盈利與虧蝕
第八周作业3
直線的斜率:水平變化 & 鉛垂變化
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三個外切圓
練習 - 逆時針旋轉(三角形)
等棍的包絡線
test geoebra1
任意角的三角函数
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Equations
Trigonometry
Translation
Combinatorics
Fractions