Description: If the complex exponential form of Fourier series, complex exponential function because the power is equal to the square of the modulus of its coefficient, the square sum of Fourier coefficients directly on the line If the triangular form of Fourier series, because the triangle function of power equal to the square of the modulus of its coefficient of half of the need to square the harmonic Fourier coefficients of half the sum of the square sum of the DC component.
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