I prefer e^(i * 2pi) = 1 (or any multiple of i 2pi). 2pi (or tau) is simply a more fundamental constant for nearly all formulas related to trigonometry and DSP

I prefer e^(i * 2pi) = 1 (or any multiple of i 2pi). 2pi (or tau) is simply a more fundamental constant for nearly all formulas related to trigonometry and DSP (excluding the sinc function).