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Evaluate: int(sqrt(1+x^2))/(1-x^2)dx...

Evaluate: `int(sqrt(1+x^2))/(1-x^2)dx`

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`int(sqrt(1+x^2))/(1-x^2)dx`
`=int(sqrt(1+x^2))/(1-x^2) xx (sqrt(1+x^2))/sqrt(1-x^2)dx`
`=int((1+x^2))/((1-x^2)sqrt(1+x^2))dx`
`=int((1))/((1-x^2)sqrt(1+x^2))dx-int(-x^2)/((1-x^2)sqrt(1+x^2))dx`
`=int((1))/((1-x^2)sqrt(1+x^2))dx-int(-x^2+1-1)/((1-x^2)sqrt(1+x^2))dx`
`=int 1/((1-x^2)sqrt(1+x^2))dx-int(1-x^2)/((1-x^2)sqrt(1))dx+int1/((1-x^2)sqrt(1+x^2))dx`
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