How can I find the fundamental period of the given signal? Can anyone help me, I am stuck.

  1. $x(t) = cos(2πt) + cos(4πt)$
  2. $y(t) = cos(2πt) + cos(2t)$

Thank you in advance.

  • 2
    $\begingroup$ dsp.stackexchange.com/a/51918/1629 $\endgroup$
    – Gilles
    Commented Sep 6, 2020 at 12:16
  • 1
    $\begingroup$ Start with the definition. The fundamental period is the shortest time period for which the signal repeats exactly. Mathematically this is expressed as x(t) = x(t+T). Obviously, once you find T, then 2T, 3T, 4T and any integer multiple of T is also a period (a repeat section of the signal). With that in mind, and if it isn't adequate, follow Gilles' link. $\endgroup$ Commented Sep 6, 2020 at 12:25


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