In the early 19th century, the French mathematician Jean-Baptiste Fourier proved that any reasonably behaved periodic function, g(t) with period T, can be constructed as the sum of a (possibly infinite) number of sines and cosines:
In the early 19th century, the French mathematician Jean-Baptiste Fourierproved that any reasonably behaved periodic function, g(t) with period T, can beconstructed as the sum of a (possibly infinite) number of sines and cosines: