What is the energy density spectrum Sxx( ) of the signal x(n)=anu(n), – McqOptions

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1.	What is the energy density spectrum Sxx( ) of the signal x(n)=anu(n), \|a\|<1?
A.	( frac{1}{1+2acos +a^2} )
B.	( frac{1}{1+2asin +a^2} )
C.	( frac{1}{1-2asin +a^2} )
D.	( frac{1}{1-2acos +a^2} )
Answer» E.

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