What is the real part of the N point DFT XR(k) of a complex valued se – McqOptions

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1.	What is the real part of the N point DFT XR(k) of a complex valued sequence x(n)?
A.	\(\sum_{n=0}^{N-1} [x_R (n) cos⁡\frac{2πkn}{N} – x_I (n) sin⁡\frac{2πkn}{N}]\)
B.	\(\sum_{n=0}^{N-1} [x_R (n) sin⁡\frac{2πkn}{N} + x_I (n) cos⁡\frac{2πkn}{N}]\)
C.	\(\sum_{n=0}^{N-1} [x_R (n) cos⁡\frac{2πkn}{N} + x_I (n) sin⁡\frac{2πkn}{N}]\)
D.	None of the mentioned
Answer» D. None of the mentioned

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