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Determine whether or not each of the following signals is periodic. If a signal is periodic, determine its fundamental period. (a) $x(t)=cos(t+?/2)$ (b) $x(t)=sin_{2}(t)$ (c) $x(t)=cos(?t/3)+cos(?t/4)$ (d) $x(t)=cost+sin2?t$

(a) The signal x(t) = cos(t + ?/2) is periodic with a fundamental period of 2?. We can see this by noting that cos(t + ?/2) = sin(t) and sin(t) has a