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## Homework Statement

Find the period of the signal x(t) = 2 + 4cos(40Pi*t) + 3cos(60Pi*t) + 4cos(120Pi*t).

## Homework Equations

## The Attempt at a Solution

The fundamental frequency (fo) = 10 Hz, since that's the greatest common factor of all the frequencies of the cosine signals. So the period would be 1/10 = 0.1 s. But my professor took points off for it, why?