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Determine whether or not each of the following signals is periodic. In case a signal is periodic, specify its fundamental period. (a) xa(t) = 3 cos(5t + π/6) (b) x(n) = 3 cos(5n + π/6 ) (c) x(n) = 2exp[j(n/6 − π)] (d) x(n) = cos(n/8) cos(π n/8) (e) x(n) = cos(π n/2) − sin(π n/8) + 3cos(π n/4 + π/3)

Determine whether or not each of the following signals is periodic. In case a signal is periodic, specify its fundamental period. (a) xa(t) = 3 cos(5t + π/6) (b) x(n) = 3 cos(5n + π/6 ) (c) x(n) = 2exp[j(n/6 − π)] (d) x(n) = cos(n/8) cos(π n/8) (e) x(n) = cos(π n/2) − sin(π n/8) + 3cos(π n/4 + π/3)

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Determine whether or not each of the following signals is periodic. In case a signal is periodic, specify its fundamental period.
(a) x a ( t ) = 3 cos ⁡ ( 5 t + π / 6 )
(b) x ( n ) = 3 cos ⁡ ( 5 n + π / 6 )
(c) x ( n ) = 2 exp ⁡ [ j ( n / 6 − π ) ]
(d) x ( n ) = cos ⁡ ( n / 8 ) cos ⁡ ( π n / 8 )
(e) x ( n ) = cos ⁡ ( π n / 2 ) − sin ⁡ ( π n / 8 ) + 3 cos ⁡ ( π n / 4 + π / 3 )

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