Given is a sine wave, 𝑔sine(𝑥)=sin[𝜔0𝑥],as a function of 𝑥 with fundamental frequency 𝑓0 — and thus 𝜔0=2𝜋𝑓0— and unit amplitude. Which of the following equations correctly expresses the Fourier series of a rectangular wave 𝑔sq(𝑥) with the same fundamental frequency and the same unit amplitude?
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