Mathematics
Senior High
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この問題の(5)でかけるのがなぜcos60°ではなくcos120°なのでしょうか

624.【内積】右の図のような 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。 G) AB:A0 *②) ABAC (3) AB.CF *(4) AD・EA (5) AD.CFR *6⑥) AD.CE

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