When searching for most students are seeking full worked answers for Chapters 2 through 8.
One notable collection includes answers from courses at the University of Michigan, Columbia University, and BJTU. Another repository hosts a full PDF of the 2nd Edition textbook alongside problem sets. Sheldon M Ross Stochastic Process 2nd Edition Solution
Autocov(t, s) = E[(X(t) - E[X(t)]) (X(s) - E[X(s)])] = E[X(t)X(s)] = E[(A cos(t) + B sin(t))(A cos(s) + B sin(s))] = E[A^2] cos(t) cos(s) + E[B^2] sin(t) sin(s) = cos(t) cos(s) + sin(t) sin(s) = cos(t-s) When searching for most students are seeking full