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Homework Help: Signal and Systems

  1. Jul 23, 2011 #1
    Hi everyone

    I really dont know how to start this questions, please help me. Thank you in advance for all your help & support.

    Determine if each of the following CT signals is periodic. If periodic find it period.
    a) x(t)=2sin(10[MATH]\pi[/MATH]t-30degrees)
    b) x(t) = 2 cos ([MATH]\sqrt[/MATH]2[MATH]\pi[/MATH]t)
    c)x(t) = 2 sin ([MATH]\sqrt[/MATH][MATH]\pi[/MATH]t)
    d) x(t) = 2 cos (t+ 60degrees)
  2. jcsd
  3. Jul 24, 2011 #2
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