Mathematics
Senior High
(2)の解き方を教えてください！
答え θ=60°
8 次の条件を満たす2つのベクトル a, 1のなす角 0 を求めよ。
(1) |a| = 2; ||=1, |30+26|=2√7
(2) ||=4, 2a_6=7, (a+b). (1-3a) = -43
解答 (1) 0120° (2) 0=60°
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