why is ∫x/(1+x^2) dx = 1/2ln(1+x^2)?(adsbygoogle = window.adsbygoogle || []).push({});

If you could just show me a couple of relevant integration rules, that would be great. I'm having trouble figuring this one out.

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# Why is ∫x/(1+x^2)dx = 1/2ln(1+x^2)?

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