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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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【案例】2013年安徽高考15题
兩位數加法
柱體建築師
球体的体积推导（优化版）
錐體建築師
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angle at centre vs angle at circumference
圓內接四邊形--預習工作紙
Question 1
f(x)=ax^2
小立方体组合的三视图-立方体可任意拖动
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Percentages
Cube
Circumcircle or Circumscribed Circle
Right Triangles
Area