Mathematics
Senior High

点Q(cosθ,sinθ)を2分のπ回転した点はどこに来るか

どうやってとけばいいですか?

Answers

単位円上の角度θの点が(cosθ,sinθ)なのでさらにπ/2回転したら
(cos(θ+π/2),sin(θ+π/2))=(-sinθ,cosθ)

ありがとうございます!

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