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fchengang
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符成岗
GeoGebra
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中華民國國旗 (Codex╱2026.10.06)
三半圓間的相切圓(Codex╱2026.10.07)
美國國旗 (Codex, 2026.10.06)
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真分數相乘
Heat Sink Fin
拋物線軌跡（內切型）
九點圓
三等分点连线围成的三角形特征（唐老师）
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Triangles
Statistics
Trigonometric Functions
Vectors 2D (Two-Dimensional)
Definite Integral