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線性變換矩陣（二階）的副本
Author:
xiaodandan
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arist
GeoGebra
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美國國旗 (Codex 版)
Claude 解幾何題
中華民國國旗 (Codex╱2026.10.06)
直角坐標平面上的旋轉變換
三半圓間的相切圓(Codex╱2026.10.07)
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geo123
Distributive Law 1 (分配率 1)
Triangle on sphere
blue
椭圆的定义
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Addition
Logarithm
Geometry
Prism
Hypothesis Testing