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I want to compute $$ \int \frac{1+x^2}{1-x^2} dx $$

I am not sure how to do this one. I need some suggestions please. By the way, I need to integrate this for homework.

I appreciate your help!

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    Have you tried something, what are some of the known techniques you posses?2012-10-14
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    I multiplied it by its conjugate, but that just makes it more complicated.2012-10-14
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    Note that "plz" is not a real word in English, but rather a short for "Platz" in German, I believe. Try to stick to *actual* words next time.2012-10-14

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