(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

I need to find the integral of 1/(x^{2}- 1) dx

The attempt at a solution

Double checking on an online integrator, it gave me an answer of

1/2 [log(x-1) - log(x+1)]

I would have expected

log(x^{2}-1)/2

Does anyone know why it's the first one?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Seemingly simple integration

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