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原式=dydx/√(x²+y²)(積分順序を変更) =dθrdr/r(極座標座標変換) =dθdr =∫(sinθ/cos²θ)dθ =-∫d(cosθ)/cos²θ =-(-1)[1/cos(π/4)-1/cos0] =√2-1.
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