[轉錄][問卦] 有沒有摳三等於西摳三減三摳的八卦
※ [本文轉錄自 Gossiping 看板]
作者: pumpkin534 (我是宅宅不是仔仔) 看板: Gossiping
標題: [問卦] 有沒有摳三等於西摳三減三摳的八卦
時間: Mon Apr 12 22:54:42 2010
有沒有小時候老師教的公式
cos3θ 摳三
=cos(2θ+θ)
=cos2θcosθ-sin2θsinθ
=(2cos^2θ-1)cosθ-(2sinθcosθ)sinθ
=2cos^3θ-cosθ-2(1-cos^2θ)cosθ
=2cos^3θ-cosθ-2cosθ+2cos^3θ
=4cos^3θ-3cosθ# 西摳三減三摳
每個人的老師都教我們用台語念 (一) 點三元=四塊三減三塊
有沒有發明這公式順口溜的八卦@@
公式修正一下 因為貼過來的時候次方自動掉下來囧
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