Since the general solution is given by:
$Y = C_1 + C_2e^{Zx}\cos(4x) + C_3e^{2x}\sin(4x)$
We can see that there are three linearly independent solutions: $1$, $e^{Zx}\cos(4x)$, and $e^{2x}\sin(4x)$.
Now, let's find the characteristic equation for each of these
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