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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)

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# Homework Help: Signal and Systems

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