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The following problem is extracted from the book digital

The following problem is extracted from the book Digital Signal Processing, chapter 7(The Discrete Fourier Transform). how to solve it?

Determine DFS coefficients of the following periodic sequences:

(a) ˜x[n] = 2 cos(πn/ 4).

(b) ˜x[n] = 3 sin( 0.25πn) + 4 cos( 0.75πn).

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Mathematics: The following problem is extracted from the book digital

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Mathematics: The following problem is extracted from the book digital

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