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两角差的正弦公式证明2
Author:
桃篮翁
GeoGebra
New Resources
直線的斜率
折扣
百分數及其應用
龙形曲线-分形龙2
多邊形的面積
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畢氏定理動態證明(歐基里得，應用時間參數跳躍函數)
畫圓
外公切線長
五邊形的簡介
咖啡杯的軌跡圖形
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Logarithm
Parallelogram
Trigonometric Functions
Bar Chart or Bar Graph
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