# Signal is periodic or not

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#### Parth86

##### Member
Hello
I understand that signal is periodic if it repeat after fixed time
Look at example

I know the signal is periodic because it repeat after 2pi period. 2pi,4pi,6pi.....20pi
How to find out that signal is periodic or not?

#### crutschow

##### Well-Known Member
It's periodic if it continues foreever with the same pattern.

#### Parth86

##### Member
It's periodic if it continues foreever with the same pattern.
Yes I agree but how to find out using example. So I tried with example. I know the condition for periodic signal but I really don't understand the logic behind condition

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