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Graph of Sine Function 正弦函數圖像
Author:
Joshua
GeoGebra
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盈利與虧蝕
平行線的判定
活动三：应用性质
第八周作业2
三角函数 的副本
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winter vacation homework 8
雜類,其他
乘法1
拋物線6--包絡線法
C60足球模型（序列+旋转）
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Combinatorics
Median Line
Ellipse
Set Theory
Vectors