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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
算柱 (兩位數)
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sanjiaohanshu
畫出對稱圖形
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