Add M_PI to maths, to allow compilation on C++
C++ does not specify `M_PI`, so this change is required to allow for compilation.
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* @{
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* @{
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*/
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*/
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#ifndef M_PI
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# define M_PI 3.14159265358979323846264338327950288
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#endif
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/**
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/**
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* The one true circumference-to-radius ratio.
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* The one true circumference-to-radius ratio.
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* See http://tauday.com/tau-manifesto
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* See http://tauday.com/tau-manifesto
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