This result came up in my diff eq class the other day:(adsbygoogle = window.adsbygoogle || []).push({});

If i = x^2 then x = [(sqrt(2)/2) + (sqrt(2)/2)i]^2

While there aren't a lot of use for complex numbers in this class, I still feel stupid for not knowing it. Another trick that I'd like to learn about is the "complexifying the integral" trick that was mentioned in this video:

www.youtube.com/watch?v=CpM1jJ0lob8

AFAICT, some of this stuff people learned in high school.. WTF.. I don't remember anything like that in high school.What books did they use for this?I don't have enough time to read an advanced undergrad level complex analysis book. I'd just like enough knowedge of complex numbers to know what's going on.

Thanks in advance.

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# Books on Elementary Complex Numbers

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