# How to intergrate this? The answer should be -2 ln(x^2 +1). I thought it was -4x*ln(x^2 +1), can someone explain to me how to get to the answer? It’s not about filling in the 1 and 0, but I didn’t know how to get rid of that :).

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#int_0^1 ((-4x)/(x^2 +1))dx#

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Sonnhard
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Jun 17, 2018

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the result is given by

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Writing

and this is

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