Please help me with the solution of the question below. Determine if it is the random process or not, x is Wide-Sense St

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Please help me with the solution of the question below.
Determine if it is the random process or not, x is
Wide-Sense Stationary(WSS), and find Px (e^jw)=?
x(n) = A cos(nω + ϕ)
where ϕ is a RV that is uniformly distributed in [-π,π] , A
is positive constant and ω is a RV that is uniformly distributed in
[wo - Δw, wo + Δw]
Sketch the proof and show every intermediate step
and details.