Mathematics
Senior High
この問題の(5)の、AD・CFの内積の求め方を教えてください！
626 . [内積の定義】 1 辺の長きが1 の正六角形 ABCDEF に
おいて, 次の内積を求めよ。 へ、
AB・A0 《
)AB・CF
) AD・CF
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