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Find the z- transform of $$\cos h(n\theta)$$
$$\frac{z(z - \cos h \theta)}{(z^2 - 2z \cosh\theta + 1)}$$
$$\frac{z(z - \cos h \theta)}{(z^2 - 2z \cosh\theta)}$$
$$\frac{(z - \cos h \theta)}{(z^2 - 2z \cosh\theta + 1)}$$
$$\frac{z(z - \cot h \theta)}{(z^2 - 2z \coth\theta + 1)}$$
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