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从初中的三角函数概念到单位圆上点坐标的定义
Author:
Zhang Guangmin
GeoGebra
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Luxembourg Symbol
Linear Approximations
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畫三角形
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Absolute time in special relativity
Refleksi terhadap sebarang persamaan garis
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สร้างรูปปริซึมหกเหลี่ยม
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