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GATE ECE 1992 | Question-29

Which of the following signals is/are periodic?

  1. $\mathrm{S}(t)=\cos 2 t+\cos 3 t+\cos 5 t$
  2. $\mathrm{S}(t)=\exp (j 8 \pi t)$
  3. $S(t)=\exp (-7 t) \sin 10 \pi t$
  4. $S(t)=\cos 2 t \cos 4 t$

     

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