Evaluate each of the following functions and see if it is periodic. If periodic, find its period.
(a) f (t) = cos π t + 2 cos 3 π t + 3 cos 5 π t
(b) y (t) = sin t + 4 cos 2π t
(c) g (t) = sin 3t cos 4t
(d) h (t) = cos2 t
(e) z (t) = 4.2 sin(0.4π t + 10°) + 0.8 sin(0.6 π t + 50°)
(f) p (t) = 10
(g) q (t) = e– π t
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