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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.