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trigonometric ratios
Author:
Sam
GeoGebra
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撒针估算面积实验
中华人民共和国国旗
科氏力 (Coriolis Force)
异形操场
比較五件物件的重量
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Geogebra 教學
start and end clock face
qqqqqqqqqq
三角函数诱导公式的副本
GGB 教程
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Equilateral Triangles
Congruence
Cube
Derivative
Cone