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一般に
z₁ = cosθ₁+isinθ₁
z₂ = cosθ₂+isinθ₂
のとき
z₁z₂ = cos(θ₁+θ₂)+isin(θ₁+θ₂)です

(11/12)π = (π/4)+(2/3)πとして、
上を逆向きに使っています

ひめの

なるほど!そういう事だったのですね。ありがとうございます!🙇🏻‍♀️

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