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GATE ECE 1992 | Question 1.29
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Which of the following signals is/are periodic?
$\mathrm{S}(t)=\cos 2 t+\cos 3 t+\cos 5 t$
$\mathrm{S}(t)=\exp (j 8 \pi t)$
$S(t)=\exp (-7 t) \sin 10 \pi t$
$S(t)=\cos 2 t \cos 4 t$
gate1992-ec
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Answer:
A;B
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