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两角和的正弦公式
Author:
zhang hongwei
Topic:
Trigonometric Functions
GeoGebra
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GeoGebra笔记功能体验课件
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球体的体积推导（优化版）
四邉形 (四年級) 教師版
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基測試題旋轉
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Tiling 2
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講義/試卷 函數圖形 (單函數) by 蒲
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Function Graph
Frequency Distribution
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