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二倍角的正弦公式的证明
Author:
桃篮翁
GeoGebra
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球体的截面
常见四边形是否是双心四边形
龙形曲线-分形龙
GeoGebra数学资源(4-8年级)
斐波那契螺旋弧线(表格法)
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層層出現的圓
Triangle Inequalities
repetitive square
Copy of 可01
动态曲线
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Rhombus
Median Line
Cone
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