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The mathematical constant tau

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# Tau

[![Build Status](https://travis-ci.org/FranklinChen/tau.png)](https://travis-ci.org/FranklinChen/tau)

Provide the famous mathematical constant, tau, τ = 6.2831...

You may be familiar with the derived constant, pi, π = τ/2 = 3.1415...

See [The Tau Manifesto](http://tauday.com/) for why pi is a historical mistake.

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