1.

The z-transform of cos( ( frac{ }{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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