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| cos(θ+dθ/2) - cos(θ-dθ/2) | ≃ dθ when θ = (1/2)π or (3/2)π
Author:
WC
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數(二)
兩位數除以一位數(一)
第八周作业
四邊形的特性
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正弦定理
對應高底圖
正12面體
hello
正N边形在圆内的滚动
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Statistical Characteristics
Cube
Right Triangles
Cuboid
Indefinite Integral