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projection2plane-vector
Author:
wenping168
GeoGebra
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平行線的斜率
垂直線的斜率
圓的切線方程
百分數及其應用
祖冲之的期望：内棋与外棋
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cvcvxcvxcvxcv
一階導函數
Question 4
Similar Triangles
向外延伸的多邊形