Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsDiscrete Fourier Sine and Cosine Transformshttp://demonstrations.wolfram.com/DiscreteFourierSineAndCosineTransforms/]]>http://demonstrations.wolfram.com/DiscreteFourierSineAndCosineTransforms/