$7\mathrm{.}5\mathrm{.}9$ Find the frequency$-$domain impedance, $\backslash (\backslash$mathbf$\{$Z$\}\backslash ),$ shown in Fig. P$7\mathrm{.}5\mathrm{.}9.$

FIGURE P$7\mathrm{.}5\mathrm{.}9$