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

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1.	What is the energy density spectrum Sxx(ω) of the signal x(n)=anu(n), \|a\|<1?
A.	1/(1+2acosω+a2 )
B.	1/(1+2asinω+a2 )
C.	1/(1-2asinω+a2 )
D.	1/(1-2acosω+a2 )
Answer» E.

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