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3 perpendicular theorem 01
Author:
tcchan
GeoGebra
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球体的体积推导（优化版）
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
判斷球體
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angle
艾雪鑲嵌2
y=sinx+1,y=2sinx,y=sin2x的圖形
數線上的中點公式
正弦曲线的生成
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Arithmetic Mean
Limits
Exponential Functions
Expected Value
Trigonometry