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行進波
Author:
ipc Wang
y=sin(3x-2t)
GeoGebra
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兩位數除以一位數（一）
画直线等分三角形的面积
錐體建築師
算柱 (兩位數)
判斷球體
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橢圓軌跡 (3)
最小值
Ex 12C NO.7
圓錐曲線---雙曲線
tube15240
對數的對稱
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Diagrams
Vectors 3D (Three-Dimensional)
Ellipse
General Quadrilateral
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