Find the fundamental period t of periodic signals

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Reference no: EM13274619

Are these signals periodic, find their fundamental period T and their fundamental frequency, otherwise prove that they are non-periodic
x(t)= 4 cos(12 t+400) + sin(16 t)
x(t)=cos4t +3e-j12t
x(t)= ej(10t+p/3)
x(t)= ejt +ej3t +sin(6t)

Reference no: EM13274619

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