http://demonstrations.wolfram.com/DiscreteFourierSineAndCosineTransforms/
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The discrete Fourier sine and cosine transforms (DST and DCT) can be used to decompose or represent a given digital signal (that is, discrete) in the form of a set of sums of sines and cosines. Four transform types are possible.
Contributed by: Daniel de Souza Carvalho
Aditional work by: Joe Bolte
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