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The formula for Fourier series is: f(x) = a_0/2 + ∑(a_ncos(nx2π/L) + b_nsin(nx2π/L)), where L is the period of the function, 'a_0' is the constant term, 'a_n' and 'b_n' are the Fourier coefficients. What is a real life example of Fourier transform?