For each signal, if it is periodic, find the fundamental period T0 and the fundamental frequency ω0. Otherwise, prove that the signal is not periodic.
(a) x(t) = cos 3t + sin 5t.
(b) x(t) = cos t + sin π t.
(c) x(t) = cos (3t) + sin(9t)
(d) x(t) = cos (3πt) + sin(4πt) + cos (5t)
(e) x(t) = cos (4πt) + sin(6πt) + ej5πt
(f) x(t) = cos (3t + 30°) + ej2t + sin(3πt)
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