Can someone please help me with this.
I don't know how to do this problem.
I really need help because I think this problem will be on my midterms coming up as my professor mentioned to study for it.
(a)
Similarly with the autocorrelation, first apply the trig identity for product of cosines, then evaluate the integral. You'll get a function of (m-k).
Plug in k=m into the autocorrelation to get the third expectation.
(b) Both mean and autocorrelation only depend on m-k, and so X is a WSS process.