Mathematics
Senior High
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（4）の問題でcos135°になるのはなぜてすか？？
□ 271辺の長さが1の正方形ABCD において,次の内積を求めよ。
*(1) AB AC
(2) ABBČ
*(3) CB DA
(4) CA・DC
□ 28 次のベクトル, について, 内積とそのなす角を求めよ。
例題
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