[issue12345] Add math.tau

[Antoine Pitrou]

Antoine Pitrou added the comment:

Le 11/08/2016 20:07, Tim Peters a écrit :
> 
> For those insisting that tau is somehow unnatural, just consider
> that the volume of a sphere with radius r is 2*tau/3*r**3 - the formula using
> pi instead is just plain impossible to remember ;-)

Thank you, I'm totally convinced now :-)

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