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sinα=3/5ってウ/エで求められてるから
sin(θ+α)=3/5=sinαが成り立つ

(α≦θ+α≦2π+α,0<α<θ/2より)
→θ+α=α,もしくはθ+α=π-α

θ=0,π-2α

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