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Find the value of int (sqrt(1 + x^2))/(1...

Find the value of `int (sqrt(1 + x^2))/(1 - x^2) dx`

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`-1/sqrt2 log abs((sqrt(1 + x^2) - xsqrt2)/(sqrt(1+x^2) + xsqrt2)) - log abs(x + sqrt(1 + x^2)) + c`
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