What is the value of |X( )| given X( )=1/(1-ae-j ), |a|<1? – McqOptions

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1.	What is the value of \|X( )\| given X( )=1/(1-ae^-j), \|a\|<1?
A.	( frac{1}{ sqrt{1-2acos +a^2}} )
B.	( frac{1}{ sqrt{1+2acos +a^2}} )
C.	( frac{1}{1-2acos +a^2} )
D.	( frac{1}{1+2acos +a^2} )
Answer» B. ( frac{1}{ sqrt{1+2acos +a^2}} )

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