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A square wave can be represented as a Fourier series, which consists of a sum of sine and cosine functions. Specifically, a square wave can be expressed using odd harmonics of the fundamental frequency. The general form of the Fourier series for a square wave is:
[ f(t) = frac{4A}{pi} sum_{n=1,3,5,ldots} frac{1}{n} sinleft(frac{2pi nt}{T}right) ]
where ( A ) is the amplitude of the wave, ( T ) is the period, and ( n ) takes odd integer values (1, 3, 5, …).
A. a fundamental sine wave and odd harmonics