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yの式を合成すると、
y=2sin(θ+π/3)=1
sin(θ+π/3)=1/2

範囲は π/3 ≦ θ+π/3 ≦ 7π/3 なので、
単位円で考えると、
θ+π/3=π/6,13π/6
θ=答え

になると思います

akari

ありがとうございます!

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