If x(n) is a real sequence, then what is the value of XI( )? – McqOptions

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1.	If x(n) is a real sequence, then what is the value of X_I( )?
A.	( sum_{n=- }^ x(n)sin u2061( n) )
B.	( sum_{n=- }^ x(n)sin u2061( n) )
C.	( sum_{n=- }^ x(n)cos u2061( n) )
D.	( sum_{n=- }^ x(n)cos u2061( n) )
Answer» C. ( sum_{n=- }^ x(n)cos u2061( n) )

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