What is the z-transform of the signal x(n)=cos(j 0n)u(n)? – McqOptions

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1.	What is the z-transform of the signal x(n)=cos(j ₀n)u(n)?
A.	( frac{z^{-1} sin omega_0}{1+2z^{-1} cos _0+z^{-2}} )
B.	( frac{z^{-1} sin omega_0}{1-2z^{-1} cos _0-z^{-2}} )
C.	( frac{1-z^{-1} cos omega_0}{1-2z^{-1} cos _0+z^{-2}} )
D.	( frac{z^{-1} sin omega_0}{1-2z^{-1} cos _0+z^{-2}} )
Answer» D. ( frac{z^{-1} sin omega_0}{1-2z^{-1} cos _0+z^{-2}} )

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