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Keywords: SquareWaveFourierArrows,rotated.gif en The six arrows represent the first six terms of the Fourier series of a square wave The two circles represent the exact square wave blue and its Fourier-series approximation purple 2014-03-08 08 41 05 https //commons wikimedia org/wiki/File SquareWaveFourierArrows gif Bob K cc-zero Uploaded with UploadWizard Mathematical animations Fourier series Square waves English text |