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两角和与差的余弦、正弦公式(动画3)
Author:
叶卢庆
GeoGebra
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龙形曲线-分形龙
盈利與虧蝕
直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
科氏力 (Coriolis Force)
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优秀资源
量角器2
test1
斜率大小
俄罗斯方块
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Derivative
Linear Programming or Linear Optimization
Dilation
Exponential Functions
Square