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Memorize some Trigonometric Values with the hand
作者：
Daniel Mentrard
主題：
餘弦
,
正弦
http://dmentrard.free.fr/GEOGEBRA/Maths/MemoratioMD.html
http://dmentrard.free.fr/GEOGEBRA/Maths/MemoratioMD.html
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