Science / Tides and Currents / Fourier Series: A series proposed by the French mathematician Fourier about the year 1807. The series involves the sines and cosines of whole multiples of a varying angle and is usually written in the following form: y =AB + A1 sin x + A2 sin 2x + A3 sin 3x + ... B1 cos x + B2 cos 2x + B3 cos 3x + ... By taking a sufficient number of terms the series may be assumed to represent any periodic function of x.
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