COS A COS B：Fourier series - Wikipedia

cos a cos b   cosmos slot In particular, the JPEG image compression standard uses the two-dimensional discrete cosine transform, a discrete form of the Fourier cosine transform, which uses only cosine as the basis function. For two-dimensional arrays with a staggered appearance, half of the Fourier series coefficients disappear, due to additional symmetry. 19

sin a cos b Fourier originally defined the Fourier series for real-valued functions of real arguments, and used the sine and cosine functions in the decomposition. Many other Fourier-related transforms have since been defined, extending his initial idea to many applications and birthing an area of mathematics called Fourier analysis

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