- #1

Jncik

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## Homework Statement

show whether or not [tex]x(t) = cos(t) + sin(\sqrt{2}*t)[/tex]

is periodic

## The Attempt at a Solution

the first period

is

T

_{1}= [tex] 2\pi[/tex]

the second period is

T

_{2}= [tex]\frac{2\pi}{\sqrt{2}}[/tex]

how can I determine whether it is periodic or not?

in my book(about signals and systems) it doesn't explain how to check this out