Viète's formula (en.wikipedia.org/wiki/Vi%C3%A8), an infinite product of nested roots evaluating to $$2/\pi$$, "the first formula of European mathematics to represent an infinite process". Now another Good Article on Wikipedia.

(More GA's to come soon, I hope. I had been trying to keep my nominations and reviews in balance but there were too few nominations to review on topics of interest, so I started nominating more often, and they're having a drive to clean out old nominations.)

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