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Trigonometric Identities
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johnmayhk
GeoGebra
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祖冲之的期望：内棋与外棋
探究三角形的全等條件
垂直線的斜率
圓周公式的應用
【案例】2018年全国1卷理科12题
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任務3
Flux of a vector field
長方形
定积分求几何体体积 Definite Integral
滚动的石头
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Differential Calculus
Addition
Sequences and Series
Parabola
Cosine