法線ベクトル〜2直線のなす鋭角〜
Synopsis
問題＞ 2直線 x+√3y-5=0，√3x+y+1=0 がなす鋭角θを求めよ。 ＜はやくち解説とは＞ かったるい説明に嫌気がさしたときに見る ...
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