$8\mathrm{.}3-2$ Two random processes $x(t)$ and $y(t)$ are

$x(t)=$Acos$({}_{0}t+),$ and $,y(t)=$Bsin$(n{}_{0}t+n+)$

where $n=$ integer $0$ and $A,B,,$ and ${}_0$ are constants, and $$ is an RV uniformly distributed in the range $(0,2).$ Show that the two processes are incoherent.