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cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
Author:
羅驥韡 (Pegasus Roe)
Topic:
Complex Numbers
GeoGebra
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兩位數加法
異分母分數減法
兩組對邊相等的四邊形
三位數除以一位數（二）
兩位數除以一位數（一）
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分數除法 1：a ÷ b（均分）
max{f(x),g(x),s(x)} 與 min{f(x),g(x),s(x)}
假的龍珠
congruent triangle_provided by Mr Yeung Kar Chun
紙張的長與闊
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Ellipse
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