i was trying to integrate [itex] \frac{1}{(t^2+1)^2} [/itex](adsbygoogle = window.adsbygoogle || []).push({});

By factoring it into [itex] \frac{1}{(t+i)^2(t-i)^2} [/itex] and then doing partial fractions.

then integrating each term using a u substitution. Ok but then how do I get the real part out of this solution. I know the arctan(t) can be extracted out of stuff of this form.

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# Integration with i.

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