Consider the periodic signal x(t) = cos(t) of fundamental period T 0 =2 sec. (a) Is the

Consider the periodic signal x(t) = cos(πt) of fundamental period T₀ =2 sec.

(a) Is the expanded signal x(t/2) periodic? if periodic indicate its fundamental period.

(b) Is the compressed signal x(2t) periodic? if periodic indicate its fundamental period.