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• 13:39, 19 April 2022 Jet53man talk contribs created page Temporary (Created page with "Fourier series, square wave <math>f(x) = \frac{c}{L} + \frac{2}{\pi} \sum_{n=1}^\infty \frac{(-1)^n}{n} \sin\frac{n\pi c}{L} \cos\frac{n\pi x}{L}</math> <math>f(x)~~~~x~~~2c~~~1~~~L~~~2L</math>")