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-1 ≤ cosA cosB cosC ≤ 1/8
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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近似值：有效數字
【案例】2018年全国1卷理科12题
異分母分數減法
三位數除以一位數（二）
判斷球體
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遊戲
F.3 Ch.10 Application of Trigonometry
ex 9
单晨答空间曲面
平面截圆锥面
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Logic
Unit Circle
Means
Incircle or Inscribed Circle
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