Notation:  cis (x) = cos (x) + i * sin(x) = e^(ix) 

Is there any article to link to, to mention the cis function?
This function can make working with Euler and De Moivre's formulas a lot easier.  It is clearer to write on paper and leads to less mistakes, not to mention faster.
An online example of cis, although not specific:   http://oakroadsystems.com/twt/sumdiff.htm

Also, a link to an article describing implementing complex exponention in software:
http://www.efg2.com/Lab/Mathematics/Complex/Numbers.htm
The code is in Pascal/Delphi.