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1つ目 tanθ^2+1=1/cosθ^2に代入して、方程式を解く。90°<θ<180°であることに注意⚠️

2つ目 sin(θ-90°)=cosθ、cos(θ-90°)=-sinθであるから、tan(θ-90°)=-1/tanθ(=1/7)

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