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Homework Help: How can i tell a period of a function involving sin and cos

  1. Jan 31, 2009 #1
    1. The problem statement, all variables and given/known data

    Ok so we started Fourier Analysis in circuits. How can i tell the Period of a function thats lets say sin(2t)+3cos(5t) something like that . Any help or url's that have information on this
  2. jcsd
  3. Jan 31, 2009 #2


    Staff: Mentor

    For your example, the period of sin(2t) is pi and the period of cos(5t) is 0.4pi. The smallest interval that is a multiple of both pi and 0.4 pi is 2pi, so that would be the period of the sum of the two functions.
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