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两角和的正弦公式
Author:
zhang hongwei
Topic:
Trigonometric Functions
GeoGebra
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【案例】2013年安徽高考15题
三位數除以一位數（二）
錐體建築師
算柱 (兩位數)
兩組對邊相等的四邊形
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Translation 平移變換
正八面體
三視圖02
Lissajous curves(利薩如圖形)
圖四的副本
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Complex Numbers
Triangles
Tangent Function
Polygons
Scalene Triangles