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Signals

Fourier series expainsion of the square wave, shown below is

$\frac{4}{\pi}\left(\cos \omega t-\frac{1}{3} \cos 3 \omega t+\frac{1}{5} \cos 5 \omega t-\ldots \ldots \ldots\right)$

$\frac{3}{\pi}(\sin \omega t+\sin 3 \omega t+\sin 5 \omega t+\ldots \ldots \ldots \ldots)$

$\frac{2}{\pi}(\cos \omega t-\cos 3 \omega t+\cos 5 \omega t-\ldots \ldots \ldots)$

$\frac{4}{\pi}\left(\sin \omega t+\frac{1}{3} \sin 3 \omega t+\frac{1}{5} \sin 5 \omega t+\ldots \ldots \ldots\right)$