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Homework Help: Fundamental period

  1. Feb 9, 2006 #1
    I can't get my answer match up with correct answer in the book:
    i need to find fundamental period of this signal:

    x(t) = 2 cos(10t + 1) - sin(4t -1)

    i used formula for cosine Acos(wt + a) = ... that gives two exponentials... so I got pi/10 instead of pi for answer...
    any help is appreciated
  2. jcsd
  3. Feb 11, 2006 #2


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    x(t) = 2 cos(10t + 1) - sin(4t -1)

    Is there an [itex]\omega[/itex] missing in this forumla?

    The +1 and -1 are phase shifts.

    10 and 4 share a gcf of 2.

    IIRC, there may be a relationship between gcf and the fundamental frequency.
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