1.

The z-transform of cos(\(\frac{π}{3}\) n) u[n] is __________

A. \(\frac{z}{2} \frac{(2z-1)}{(z^2-z+1)}\), 0<|z|<1
B. \(\frac{z}{2} \frac{(2z-1)}{(z^2-z+1)}\), |z|>1
C. \(\frac{z}{2} \frac{(1-2z)}{(z^2-z+1)}\), 0<|z|<1
D. \(\frac{z}{2} \frac{(1-2z)}{(z^2-z+1)}\), |z|>1
Answer» C. \(\frac{z}{2} \frac{(1-2z)}{(z^2-z+1)}\), 0<|z|<1


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