凑微分 求大神∫ dx/(a² + x²)= ∫ dx/[a²(1 + x²/a²)]= (1/a²)∫ dx/(1 + x²/a²)= (1/a²)∫ d(x/a · a)/(1 + x²/a²)= (1/a²)(a)∫ d(x/a)/(1 + x²/a²)= (1/a)∫ d(x/a)/[1 + (x/a
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![凑微分 求大神∫ dx/(a² + x²)= ∫ dx/[a²(1 + x²/a²)]= (1/a²)∫ dx/(1 + x²/a²)= (1/a²)∫ d(x/a · a)/(1 + x²/a²)= (1/a²)(a)∫ d(x/a)/(1 + x²/a²)= (1/a)∫ d(x/a)/[1 + (x/a](/uploads/image/z/9814790-38-0.jpg?t=%E5%87%91%E5%BE%AE%E5%88%86+%E6%B1%82%E5%A4%A7%E7%A5%9E%E2%88%AB+dx%2F%28a%26sup2%3B+%2B+x%26sup2%3B%29%3D+%E2%88%AB+dx%2F%5Ba%26sup2%3B%281+%2B+x%26sup2%3B%2Fa%26sup2%3B%29%5D%3D+%281%2Fa%26sup2%3B%29%E2%88%AB+dx%2F%281+%2B+x%26sup2%3B%2Fa%26sup2%3B%29%3D+%281%2Fa%26sup2%3B%29%E2%88%AB+d%28x%2Fa+%C2%B7+a%29%2F%281+%2B+x%26sup2%3B%2Fa%26sup2%3B%29%3D+%281%2Fa%26sup2%3B%29%28a%29%E2%88%AB+d%28x%2Fa%29%2F%281+%2B+x%26sup2%3B%2Fa%26sup2%3B%29%3D+%281%2Fa%29%E2%88%AB+d%28x%2Fa%29%2F%5B1+%2B+%28x%2Fa)
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