Mathematics
Senior High
Resolved
このc はどうやったらすぐに出せますか?
(2) 余弦定理により
2°=(√6)2+c2-2√6ccos 45°
式を整理すると
c2-2√3c+2=0
これを解くと
c = √3 ±1
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分かりました!ありがとうございます!