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两角和的余弦公式几何证明
Author:
桃篮翁
GeoGebra
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龙形曲线-分形龙2
科氏力 (Coriolis Force)
撒针估算面积实验
龙形曲线-分形龙
盈利與虧蝕
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盒子的體積
n星角
三角柱算體積(可以切開)
圓柱切割
常见几个曲面
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Quadrilaterals
Algebra
Tangent Function
LCM and GCD
Square