I have tried using the putting it into $\cos(n\theta)$ = $\frac{z (z-cos\theta)}{z^2 - 2zcos\theta+1}$ formula, but my answer is wrong.
$u_n = \cos(n+1)\theta.$
2026-03-27 16:54:04.1774630444
What is the Z-Transform $u_n =\cos(n+1)\theta$?
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