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We can use Eq. (1.7) to determine its mean square value,

The same result is obtained from its Fourier series representation using Eq. (1.10):

Recalling that the root mean square value is given by the square root of the mean square value, the rms value of this saw tooth signal is . Note the difference between the rms value obtained in this example and that in Eq. (1.9) for a sine wave.