sciencetick__ on Instagram: "Pi is the constant ratio of a circle's circumference to its diameter, and its decimal expansion goes on forever without repeating. In this video we see a simple, but visually interesting, example of a complex exponential sum (a two-term Fourier series with incommensurate frequencies) where Pi shows up as one of the angular speeds. The function is: z(0) = e^(i0) + e^(in0) The symbol we write as ≈ 3.14159 is an irrational number, and its decimal expansion goes on forev