# Fourier series expansions of Periodic Signals

Use the Fourier series expansions of periodic square wave and triangular signals to find the sum of the following series:

1 - 1/3 + 1/5 - 1/7 + ...

1 + 1/9 + 1/25 + 1/49 + ...

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#### Solution Preview

Please see the attached file.

We write the triangle wave as:

It looks like:

This function is symmetric; hence we will expand it as a cosine series. For a function defined in the ...

#### Solution Summary

The solution explains the Fourier series expansions for the Periodic Signals. Periodic square waves and triangular signals to find the sum of functions are examined.

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