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Evaluate: intsqrt((1+x)/x)\ dx...

Evaluate: `intsqrt((1+x)/x)\ dx`

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I= `intsqrt((1+x)/x)\ dx`
Let `x=u^2`
`dx=2udu`
I= `intsqrt((1+u^2)/u^2)\ 2udu`
=`2int(1+u^2)du`
=`sqrt(1+u^2)+ln|u+sqrt(1+u^2)|+c`
=`sqrt(1+x)+ln|sqrt(x)+sqrt(1+x)|+c`
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