Suppose that x1(t) is periodic with period T1 and that x2(t) is periodic with period T2.
(a) Show that the sum
x(t) = x1(t) + x2(t)
is periodic only if the ratio T1 / T2 is equal to a ratio of two integers k2/k1.
(b) Find the fundamental period T0 of x(t), for T1/T2 = k2/k1.
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