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Forget pi, it's cos squared that's wrong!

For a while now, a debate has been raging about whether we should scrap using pi in all our equations and instead write everything in terms of tau (which is 2 pi). Most of the time I stand at a distance from this debate, thinking it rather tedious and preferring instead to fun things with pi like draw its digits in chalk on the footpath. But every so often I get involved.

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