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餘弦定理

Author:yuchengda

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判斷球體
直角坐標平面上的旋轉變換
【案例】2013年安徽高考15题
異分母分數減法
兩組對邊相等和有直角的四邊形

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Quiz on Joint Variation 聯變：測驗
二次函数与一元二次方程和一元二次不等式
近期新增圖檔
ptccs2new4
橢圓1--四圓心近似法

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Trigonometry
Normal Distribution
Triangles
Parallelogram
Planes

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