[issue12345] Add math.tau

[Vedran Čačić]

Vedran Čačić added the comment:

> However an honest and non partisan web site would list all the use of pi without 2 where the formula would be more complicated. I don't see that so I'm still not convinced.

"non partisan" is probably hard to find, but if you want to see the other side of the story, http://www.thepimanifesto.com/ is probably most accessible.

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