- #1

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## Homework Statement

[tex]\int_0^1 \frac{1}{\sqrt{x^2+1}}\,dx[/tex]

## Homework Equations

Integration by substitution looks like it might help here...

## The Attempt at a Solution

The answer is [tex]\log (1+\sqrt 2)[/tex], but I'm at a loss as to how to derive that.