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三角形面積(由面積求高)
Author:
lkkbmaths teachers 檔案儲存用
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动态二面角
测试
毕氏螺线
未命名
GGB printable logo 3
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平移函數的切線(三次)
Magnitude of cosine
Physics
找规律（数阵与点阵）
bob liu-SSS
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Hyperbola
Rhombus
Diagrams
Fractal Geometry
Real Numbers