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4.6兩角和與差的正弦、餘弦、正切(一)
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user9429
GeoGebra
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盈利與虧蝕
折扣
双心四边形
常见四边形是否是双心四边形
百分數及其應用
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tessellation design
multiplication of complex number in unit circle
點到直線的距離9：常數項差距與距離比為法向量長度
F.3 Ch.10 Application of Trigonometry
HCF 和 LCM 的應用
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Median Line
Integers
Pie Chart or Circle Chart
Set Theory
Natural Numbers