2. (5+5+5+5 points) Determine whether or not each of the following signals is periodic. If the signal is periodic, determine its fundamental period. (Even {f(t)} denotes the even part of f(t)) (a) x(t) = 3 cos 4t + π (b) x(t) = = Even {cos (4лt)u(t)} (c) x[n] = sin σπ ―n+1 1) (d) x[n] = cos (n) cos (n)

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