I'm trying to do the following:(adsbygoogle = window.adsbygoogle || []).push({});

int (3x^3 + 4x)/(x^2+1)^2 dx

I let u = x^2+1 and I eventually get:

int 3(u-1)+4/u^2 du/2 When I further break this down, I get:

1/2 int 3u^-1 -u^-2 du am I on the right track? When I integrate this, I'm thinking that I have to be doing something wrong...

Any suggestions?

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# Integ prob but I'm stuck

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