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## Homework Statement

Determine the Fourier series for the periodic function of period 2∏ defined by:

-2 when (-∏ ) ∠ x ∠ (-∏/2)

f(x)= 2 when ( -∏/2) ∠ x ∠ (∏ /2)

-2 when (∏/2) ∠ x ∠ (∏)

how to start i?. I have already drawn it but what next.

thank you