Use Euler% relation to represent the signal x 3 [n] = cos(2pk 0 n/N) as a sum of two complex…

Use Euler% relation to represent the signal x3[n] = cos(2πk0n/N) as a sum of two complex exponentials. Use the fact that the DM', like its cousins the z-transform and the DTFT, is a linear operation to show that

 

 
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