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definition of trigo
Author:
sealion1215
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伞骨架模型
正方形折纸减去两角
繪畫梯形
勒洛四面体（参数曲面法）
小正多边形在大正多边形内的滚动（边长相等）
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線性變換
雙曲線與共軛雙曲線
asasd
S.3 ch7 area and volume 3
Copy of Linear Transformations
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Multiplication
Diagrams
Cube
Linear Functions
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